[compiler-rt] [XRay] Run tests inside bootstrapping build (PR #168378)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-rhel` running on `ppc64le-clang-rhel-test` while building `compiler-rt` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/145/builds/11198

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'XRay-powerpc64le-linux :: TestCases/Posix/default-options.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
rm -fr /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/compiler-rt/test/xray/POWERPC64LELinuxConfig/TestCases/Posix/Output/default-options.cpp.tmp && mkdir /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/compiler-rt/test/xray/POWERPC64LELinuxConfig/TestCases/Posix/Output/default-options.cpp.tmp && cd /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/compiler-rt/test/xray/POWERPC64LELinuxConfig/TestCases/Posix/Output/default-options.cpp.tmp # RUN: at line 1
+ rm -fr /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/compiler-rt/test/xray/POWERPC64LELinuxConfig/TestCases/Posix/Output/default-options.cpp.tmp
+ mkdir /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/compiler-rt/test/xray/POWERPC64LELinuxConfig/TestCases/Posix/Output/default-options.cpp.tmp
+ cd /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/compiler-rt/test/xray/POWERPC64LELinuxConfig/TestCases/Posix/Output/default-options.cpp.tmp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/./bin/clang  -fxray-instrument  -m64 -fno-function-sections  /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/compiler-rt/test/xray/TestCases/Posix/default-options.cpp -o a.out # RUN: at line 2
+ /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/./bin/clang -fxray-instrument -m64 -fno-function-sections /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/compiler-rt/test/xray/TestCases/Posix/default-options.cpp -o a.out
ld.lld: error: undefined symbol: std::__throw_system_error(int)
>>> referenced by std_mutex.h:104 (/opt/rh/gcc-toolset-12/root/usr/lib/gcc/ppc64le-redhat-linux/12/../../../../include/c++/12/bits/std_mutex.h:104)
>>>               xray_basic_logging.cpp.o:(__xray::basicLoggingInit(unsigned long, unsigned long, void*, unsigned long)::$_0::__invoke()) in archive /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/lib/clang/22/lib/powerpc64le-unknown-linux-gnu/libclang_rt.xray-basic.a
>>> referenced by std_mutex.h:104 (/opt/rh/gcc-toolset-12/root/usr/lib/gcc/ppc64le-redhat-linux/12/../../../../include/c++/12/bits/std_mutex.h:104)
>>>               xray_basic_logging.cpp.o:(__xray::getLog()::$_0::__invoke()) in archive /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/lib/clang/22/lib/powerpc64le-unknown-linux-gnu/libclang_rt.xray-basic.a
>>> referenced by std_mutex.h:104 (/opt/rh/gcc-toolset-12/root/usr/lib/gcc/ppc64le-redhat-linux/12/../../../../include/c++/12/bits/std_mutex.h:104)
>>>               xray_fdr_logging.cpp.o:(__xray::fdrCommonHeaderInfo()::$_0::__invoke()) in archive /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/lib/clang/22/lib/powerpc64le-unknown-linux-gnu/libclang_rt.xray-fdr.a
>>> referenced 1 more times
clang: error: linker command failed with exit code 1 (use -v to see invocation)

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/168378