[compiler-rt] [compiler-rt][rtsan] copy_file_range interception for Linux. (PR #129026)

[Chris Apple via llvm-commits]

================
@@ -887,6 +887,17 @@ TEST_F(RtsanOpenedFileTest, FtruncateDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
+#if _FILE_OFFSET_BITS == 64 && SANITIZER_LINUX
----------------
cjappl wrote:

Ah, yes I think let's remove it from CMakeLists.txt. I don't see any of the other sanitizers doing it, and we pass it in to the unit tests as appropriate 

```cpp
compiler-rt/lib/rtsan/tests/CMakeLists.txt
88:      CFLAGS ${RTSAN_UNITTEST_CFLAGS} -D_FILE_OFFSET_BITS=64 -fsanitize=realtime
```

https://github.com/llvm/llvm-project/pull/129026