[compiler-rt] [compiler-rt][rtsan] intercept fflush. (PR #121643)

[via llvm-commits]

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@@ -292,6 +292,11 @@ INTERCEPTOR(int, fputs, const char *s, FILE *stream) {
   return REAL(fputs)(s, stream);
 }
 
+INTERCEPTOR(int, fflush, FILE *stream) {
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davidtrevelyan wrote:

Do you plan to add `fpurge` as well? `man fflush` on Darwin also contains details for `fpurge` - it might be nice to do them both at the same time

https://github.com/llvm/llvm-project/pull/121643