[llvm] [AMDGPU][MC] GFX9 - Support NV bit in FLAT instructions in pre-GFX90A (PR #154237)

[Ivan Kosarev via llvm-commits]

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@@ -1585,6 +1585,11 @@ class AMDGPUAsmParser : public MCTargetAsmParser {
 
   bool hasKernargPreload() const { return AMDGPU::hasKernargPreload(getSTI()); }
 
+  bool isFlatInstAndNVAllowed(const MCInst &Inst) const {
+    uint64_t TSFlags = MII.get(Inst.getOpcode()).TSFlags;
+    return (TSFlags & SIInstrFlags::FLAT) && isGFX9() && !isGFX90A();
+  }
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kosarev wrote:

We use DiagnosticString downstream already.

https://github.com/llvm/llvm-project/pull/154237