[TSan][libdispatch] Delete old tests

In a previous commit, I re-enabled the ported variants of these 2 tests:
tsan/Darwin/gcd-data.mm -> tsan/libdispatch/data.c
tsan/Darwin/gcd-source-serial.mm -> tsan/libdispatch/source-serial.c

So now we can delete the Darwin-only version.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358235 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed