[llvm] [LLVM][IR] Add textual shorthand for specifying constant vector splats. (PR #74620)

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git-clang-format --diff 0e1a9e3084cd8dffa5d4f2cf6eabf9e7721e1cdd 59bdd367cbfa7ed793085b4997b497a4d2dca30f -- llvm/include/llvm/AsmParser/LLParser.h llvm/include/llvm/AsmParser/LLToken.h llvm/lib/AsmParser/LLLexer.cpp llvm/lib/AsmParser/LLParser.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/AsmParser/LLParser.h b/llvm/include/llvm/AsmParser/LLParser.h
index 2fa8fd1217..0652fe80a1 100644
--- a/llvm/include/llvm/AsmParser/LLParser.h
+++ b/llvm/include/llvm/AsmParser/LLParser.h
@@ -51,16 +51,23 @@ namespace llvm {
   /// or a symbolic (%var) reference.  This is just a discriminated union.
   struct ValID {
     enum {
-      t_LocalID, t_GlobalID,           // ID in UIntVal.
-      t_LocalName, t_GlobalName,       // Name in StrVal.
-      t_APSInt, t_APFloat,             // Value in APSIntVal/APFloatVal.
-      t_Null, t_Undef, t_Zero, t_None, t_Poison, // No value.
-      t_EmptyArray,                    // No value:  []
-      t_Constant,                      // Value in ConstantVal.
-      t_ConstantSplat,                 // Value in ConstantVal.
-      t_InlineAsm,                     // Value in FTy/StrVal/StrVal2/UIntVal.
-      t_ConstantStruct,                // Value in ConstantStructElts.
-      t_PackedConstantStruct           // Value in ConstantStructElts.
+      t_LocalID,
+      t_GlobalID, // ID in UIntVal.
+      t_LocalName,
+      t_GlobalName, // Name in StrVal.
+      t_APSInt,
+      t_APFloat, // Value in APSIntVal/APFloatVal.
+      t_Null,
+      t_Undef,
+      t_Zero,
+      t_None,
+      t_Poison,              // No value.
+      t_EmptyArray,          // No value:  []
+      t_Constant,            // Value in ConstantVal.
+      t_ConstantSplat,       // Value in ConstantVal.
+      t_InlineAsm,           // Value in FTy/StrVal/StrVal2/UIntVal.
+      t_ConstantStruct,      // Value in ConstantStructElts.
+      t_PackedConstantStruct // Value in ConstantStructElts.
     } Kind = t_LocalID;
 
     LLLexer::LocTy Loc;

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https://github.com/llvm/llvm-project/pull/74620