[clang] [compiler-rt] [XRay][Darwin] Enable XRay runtime on macOS (arm64/x86_64) (PR #196848)

[Dan Blackwell via cfe-commits]

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@@ -67,7 +67,13 @@ inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
 
 ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT {
   timespec TS;
-  int result = clock_gettime(CLOCK_REALTIME, &TS);
+  int result = clock_gettime(
+#if SANITIZER_APPLE
+      CLOCK_MONOTONIC_RAW,
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DanBlackwell wrote:

Why not use `CLOCK_REALTIME` on apple?

https://github.com/llvm/llvm-project/pull/196848