Support 'd' flag on RegExp #2284

Job	Run time
build-test-api	1m 40s
build-by-clang	1m 44s
build-on-macos	3m 13s
build-on-windows-x64-uwp-x86-shared	9m 58s
build-test-codecache	9m 58s
build-test-debugger	1m 35s
build-test-on-android (x86, 28)	8m 59s
build-test-on-android (x86_64, 28)	8m 51s
build-test-on-self-hosted-arm64-linux	1m 11s
build-test-on-self-hosted-arm-linux	1m 11s
build-test-on-self-hosted-linux	31s
build-test-on-x64-release (octane v8 web-tooling-benchmark)	9m 58s
build-test-on-x86-release (new-es octane)	9m 56s
build-test-on-x86-release (v8 chakracore spidermonkey)	9m 56s
build-test-on-x86-x64-debug	1m 42s
build-test-wasmjs	1m 29s
build-test-on-x86-release (jetstream-only-simple-parallel-1)	9m 57s
build-test-on-x64-release (octane v8 web-tooling-benchmark, -DESCARGOT_THREADING=ON -DESCARGOT_TC...	9m 56s
build-test-on-x86-release (jetstream-only-simple-parallel-2 jsc-stress)	9m 56s
build-test-on-x64-release (chakracore spidermonkey new-es)	9m 57s
check-tidy	55s
build-test-on-x86-release (jetstream-only-simple-parallel-3 jetstream-only-cdjs)	9m 56s
build-test-on-x64-release (chakracore spidermonkey new-es, -DESCARGOT_THREADING=ON -DESCARGOT_TCO...	9m 57s
test-on-windows-clang-cl (x86, -m32)	7m 16s
build-test-on-x64-release (chakracore spidermonkey new-es, -DESCARGOT_SMALL_CONFIG=ON -DESCARGOT_...	9m 55s
test-on-windows-x86-x64 (x86)	7m 3s
test-on-windows-x86-x64 (x64)	7m 14s
	2h 53m 54s

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