[clang] [llvm] [RISCV] Add MC layer support for XSfmm*. (PR #133031)

[Philip Reames via cfe-commits]

================
@@ -34,7 +34,7 @@ body:             |
     renamable $v11 = PseudoVMV_S_X undef renamable $v11, %1, 8, 5 /* e32 */
     renamable $v8 = PseudoVLE64_V_M1 undef renamable $v8, %2, 1, 6 /* e64 */, 
2 /* tu, ma */ :: (load unknown-size, align 8)
     renamable $v9 = PseudoVLE32_V_M1 undef renamable $v9, %3, 8, 5 /* e32 */, 
2 /* tu, ma */ :: (load unknown-size, align 4)
-    INLINEASM &"# use $0 $1 $2 $3", 1 /* sideeffect attdialect */, 3997705 /* 
reguse:VR */, killed renamable $v10, 3997705 /* reguse:VR */, killed renamable 
$v11, 3997705 /* reguse:VR */, killed renamable $v8, 3997705 /* reguse:VR */, 
killed renamable $v9
+    INLINEASM &"# use $0 $1 $2 $3", 1 /* sideeffect attdialect */, 4194313 /* 
reguse:VR */, killed renamable $v10, 4194313 /* reguse:VR */, killed renamable 
$v11, 4194313 /* reguse:VR */, killed renamable $v8, 4194313 /* reguse:VR */, 
killed renamable $v9
----------------
preames wrote:

Can you explain this change?

https://github.com/llvm/llvm-project/pull/133031
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