Map const-values in output file map for incremental

[vikage]

Since we extracting swiftconstvalues from #1170
But we forgot to update the path for swiftconstvalues in the incremental output file map.
It leads to the incremental feature not working.

For example, demo: https://github.com/vikage/DemoBazelSwiftIncremental
When I change file B.swift (No other file uses struct B) but log shows build A.swift and C.swift as well

I used -driver-show-job-lifecycle and -driver-show-incremental flags to show debug log

WARNING: Build option --swiftcopt has changed, discarding analysis cache (this can be expensive, see https://bazel.build/advanced/performance/iteration-speed).
INFO: Analyzed target //:Demo (99 packages loaded, 1088 targets configured).
INFO: From Compiling Swift module //:Demo:
remark: Incremental compilation: Read dependency graph '/private/var/tmp/_bazel_elliotvu/e512a8189164dd2ae5386a6bdb0cc34e/execroot/_main/bazel-out/darwin_arm64-fastbuild/bin/_swift_incremental/Demo.output_file_map.priors'
remark: Incremental compilation: Enabling incremental cross-module building
remark: Incremental compilation: May skip current input:  {compile: A.swift.o <= A.swift}
remark: Incremental compilation: May skip current input:  {compile: B.swift.o <= B.swift}
remark: Incremental compilation: May skip current input:  {compile: C.swift.o <= C.swift}
remark: Incremental compilation: Missing an output; will queue  {compile: A.swift.o <= A.swift}
remark: Incremental compilation: Missing an output; will queue  {compile: B.swift.o <= B.swift}
remark: Incremental compilation: Missing an output; will queue  {compile: C.swift.o <= C.swift}
remark: Incremental compilation: Queuing (initial):  {compile: A.swift.o <= A.swift}
remark: Incremental compilation: Queuing (initial):  {compile: B.swift.o <= B.swift}
remark: Incremental compilation: Queuing (initial):  {compile: C.swift.o <= C.swift}
remark: Found 3 batchable jobs
remark: Forming into 1 batch
remark: Adding {compile: A.swift} to batch 0
remark: Adding {compile: B.swift} to batch 0
remark: Adding {compile: C.swift} to batch 0
remark: Forming batch job from 3 constituents: A.swift, B.swift, C.swift
remark: Starting Emitting module for Demo
remark: Finished Emitting module for Demo
remark: Starting Compiling A.swift, B.swift, C.swift
remark: Finished Compiling A.swift, B.swift, C.swift
remark: Incremental compilation: Reading dependencies from A.swift
remark: Incremental compilation: Reading dependencies from B.swift
remark: Incremental compilation: Reading dependencies from C.swift
remark: Incremental compilation: Scheduling all post-compile jobs because something was compiled

These are logs after fix. As you can see, only B.swift will be compile

INFO: Analyzed target //:Demo (0 packages loaded, 0 targets configured).
INFO: From Compiling Swift module //:Demo:
remark: Incremental compilation: Read dependency graph '/private/var/tmp/_bazel_elliotvu/e512a8189164dd2ae5386a6bdb0cc34e/execroot/_main/bazel-out/darwin_arm64-fastbuild/bin/_swift_incremental/Demo.output_file_map.priors'
remark: Incremental compilation: Enabling incremental cross-module building
remark: Incremental compilation: May skip current input:  {compile: A.swift.o <= A.swift}
remark: Incremental compilation: Scheduling changed input  {compile: B.swift.o <= B.swift}
remark: Incremental compilation: May skip current input:  {compile: C.swift.o <= C.swift}
remark: Incremental compilation: Queuing (initial):  {compile: B.swift.o <= B.swift}
remark: Incremental compilation: not scheduling dependents of B.swift; unknown changes
remark: Incremental compilation: Skipping input:  {compile: A.swift.o <= A.swift}
remark: Incremental compilation: Skipping input:  {compile: C.swift.o <= C.swift}
remark: Found 1 batchable job
remark: Forming into 1 batch
remark: Adding {compile: B.swift} to batch 0
remark: Forming batch job from 1 constituents: B.swift
remark: Starting Emitting module for Demo
remark: Finished Emitting module for Demo
remark: Starting Compiling B.swift
remark: Finished Compiling B.swift
remark: Incremental compilation: Reading dependencies from B.swift
remark: Incremental compilation: Fingerprint changed for existing interface of top-level name 'B' in B.swift
remark: Incremental compilation: Fingerprint changed for existing implementation of top-level name 'B' in B.swift
remark: Incremental compilation: Fingerprint changed for existing interface of type '4Demo1BV' in B.swift
remark: Incremental compilation: Fingerprint changed for existing implementation of type '4Demo1BV' in B.swift
remark: Incremental compilation: Fingerprint changed for existing interface of potential members of '4Demo1BV' in B.swift
remark: Incremental compilation: Fingerprint changed for existing implementation of potential members of '4Demo1BV' in B.swift
remark: Incremental compilation: Scheduling all post-compile jobs because something was compiled
remark: Skipped Compiling A.swift
remark: Skipped Compiling C.swift

The solution here should be to remap swiftconstvalues path to _swift_incremental directory
Related issue: #1291

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[vikage]

@brentleyjones I saw the same failure reason with other PRs and scheduled build on master branch. It looks like we have something wrong with CI.
Could you help me merge this PR? Thanks!

[vikage]

@aaronsky @brentleyjones @BalestraPatrick @keith @luispadron @mattrobmattrob @thii
Hey guys, please help me merge this PR since we have a problem with CI. Thanks!

[aaronsky]

I put up #1472 to try and dig into this, but no timetable on a fix.