[compiler-rt] [sanitizer] Fix asserts in asan and tsan in pthread interceptors. (PR #75394)

[via llvm-commits]

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@@ -4,10 +4,15 @@
 // FIXME: Crashes on some bots in pthread_exit.
 // RUN: %run %t %if tsan %{ 0 %} %else %{ 1 %}
 
+// Check interceptors' return codes are the same without sanitizers.
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goussepi wrote:

I meant it as a sanity check to double check the interceptors returns the same error code as the intercepted functions.
Not strictly required so happy to remove.

https://github.com/llvm/llvm-project/pull/75394