[llvm] Add extended mnemonics (PR #97571)

[Kai Nacke via llvm-commits]

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@@ -464,6 +469,8 @@ let isAsCheapAsAMove = 1, isMoveImm = 1, isReMaterializable = 1 in {
   def LLILF : UnaryRIL<"llilf", 0xC0F, bitconvert, GR64, imm64lf32>;
   def LLIHF : UnaryRIL<"llihf", 0xC0E, bitconvert, GR64, imm64hf32>;
 }
+def LLGFI : InstAlias<"llgfi\t$R1, $RI1",(LLILF GR64:$R1, imm64lf32:$RI1)>;
+def LLGHI : InstAlias<"llghi\t$R1, $RI1",(LLILL GR64:$R1, imm64ll16:$RI1)>;
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redstar wrote:

```suggestion
def LLGFI : InstAlias<"llgfi\t$R1, $RI1", (LLILF GR64:$R1, imm64lf32:$RI1)>;
def LLGHI : InstAlias<"llghi\t$R1, $RI1", (LLILL GR64:$R1, imm64ll16:$RI1)>;
```
```suggestion
def LLGFI : InstAlias<"llgfi\t$R1, $RI1",(LLILF GR64:$R1, imm64lf32:$RI1)>;
def LLGHI : InstAlias<"llghi\t$R1, $RI1",(LLILL GR64:$R1, imm64ll16:$RI1)>;
```

https://github.com/llvm/llvm-project/pull/97571