[llvm] [MCA] Enable customization of individual instructions (PR #155420)

[Roman Belenov via llvm-commits]

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@@ -143,19 +146,27 @@ class LLVM_ABI InstrumentManager {
 protected:
   const MCSubtargetInfo &STI;
   const MCInstrInfo &MCII;
+  bool EnableDefaults;
+  std::unique_ptr<InstrumentManager> TargetIM;
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r-belenov wrote:

I'd like to have InstrDesc customization generic (e.g. latency change code is generic, other things I do locally also do not require target details) and coexist with target-specific instrumentation.

https://github.com/llvm/llvm-project/pull/155420