[BUG] TSAN linkage is broken in r21

[vlovich]

Description

A basic test program fails to link against TSAN on r21 with:

/toolchain/llvm-project/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc:428: error: undefined reference to '__tsan::__interception::real_setjmp'
/toolchain/llvm-project/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc:428: error: undefined reference to '__tsan::__interception::real_setjmp'

This has been fixed in upstream rL365806 but r21 has been branched from r365631 before this fix was landed.

Test case:

#include <future>

int main() {
  while (true) {
    auto f = std::async([] { return 123; });
    if (!f.valid()) {
      return 1;
    }
    if (f.get() != 123) {
      return 1;
    }
    if (f.valid()) {
      return 1;
    }
  }
}

Environment Details

Pkg.Desc = Android NDK
Pkg.Revision = 21.0.6113669

Build system: Standalone toolchain
Host OS: Windows & Mac

[DanAlbert]

Same answer as in #1171 for now. Closing as dup