[clang] [llvm] [RISCV] Support Xsfvfwmaccqqq extensions (PR #68296)

[Shao-Ce SUN via cfe-commits]

================
@@ -813,6 +813,14 @@ def HasVendorXSfcie : 
Predicate<"Subtarget->hasVendorXSfcie()">,
                         AssemblerPredicate<(all_of FeatureVendorXSfcie),
                         "'XSfcie' (SiFive Custom Instruction Extension 
SCIE.)">;
 
+def FeatureVendorXSfvfwmaccqqq
+    : SubtargetFeature<"xsfvfwmaccqqq", "HasVendorXSfvfwmaccqqq", "true",
+                       "'XSfvfwmaccqqq' (SiFive Matrix Multiply Accumulate 
Instruction and 4-by-4))",
+                       [FeatureStdExtZve32x]>;
----------------
sunshaoce wrote:

and `zvfbfmin`

https://github.com/llvm/llvm-project/pull/68296
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