do not show unused block on `send` #893

Job	Run time
make (check, cppflags=-DVM_CHECK_MODE)	9m 9s
make (check, i686)	11m 20s
make (check, --disable-yjit)	7m 13s
make (check, --enable-shared --enable-load-relative)	7m 34s
make (check, true, /home/runner/ruby_gc, --with-shared-gc=/home/runner/ruby_gc)	7m 40s
make (test-bundler-parallel)	44m 0s
make (test-bundled-gems)	19m 20s
make (check, ubuntu-20.04)	9m 51s
Ubuntu result	1s
	1h 56m 8s

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