[llvm] [NFC][RISCV] Unify all zvfbfa vl patterns and sd node patterns (PR #171072)

[Craig Topper via llvm-commits]

================
@@ -1333,34 +1348,46 @@ foreach vti = AllFloatVectors in {
 
     // 13.12. Vector Floating-Point Sign-Injection Instructions
     def : Pat<(fabs (vti.Vector vti.RegClass:$rs)),
-              (!cast<Instruction>("PseudoVFSGNJX_VV_"# vti.LMul.MX#"_E"#vti.SEW)
+              (!cast<Instruction>("PseudoVFSGNJX_"#
+                                  !if(!eq(vti.Scalar, bf16), "ALT_", "")#
+                                  "VV_"# vti.LMul.MX#"_E"#vti.SEW)
----------------
topperc wrote:

I think I'd rather insert "_ALT" instead of "ALT_". That's makes it more similar to the "BF16" insertion in `VPatWidenFPMulAccSDNode_VV_VF_RM`

```suggestion
              (!cast<Instruction>("PseudoVFSGNJX"#
                                  !if(!eq(vti.Scalar, bf16), "_ALT", "")#
                                  "_VV_"# vti.LMul.MX#"_E"#vti.SEW)
```

https://github.com/llvm/llvm-project/pull/171072