[clang] [llvm] [RISCV] Implement MC support for Zvfbfa extension (PR #151106)

[Craig Topper via cfe-commits]

================
@@ -216,9 +216,12 @@ void RISCVInstPrinter::printVTypeI(const MCInst *MI, 
unsigned OpNo,
                                    const MCSubtargetInfo &STI, raw_ostream &O) 
{
   unsigned Imm = MI->getOperand(OpNo).getImm();
   // Print the raw immediate for reserved values: vlmul[2:0]=4, 
vsew[2:0]=0b1xx,
-  // or non-zero in bits 8 and above.
+  // , altfmt=1 without zvfbaf extension, or non-zero in bits 9 and above.
----------------
topperc wrote:

```suggestion
  // altfmt=1 without zvfbfa extension, or non-zero in bits 9 and above.
```

https://github.com/llvm/llvm-project/pull/151106
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