[clang] [llvm] [AMDGPU][clang][CodeGen][opt] Add late-resolved feature identifying predicates (PR #134016)

[Erich Keane via cfe-commits]

================
@@ -64,6 +68,11 @@ class SemaAMDGPU : public SemaBase {
   void handleAMDGPUNumVGPRAttr(Decl *D, const ParsedAttr &AL);
   void handleAMDGPUMaxNumWorkGroupsAttr(Decl *D, const ParsedAttr &AL);
   void handleAMDGPUFlatWorkGroupSizeAttr(Decl *D, const ParsedAttr &AL);
+
+  /// Expand a valid use of the feature identification builtins into its
+  /// corresponding sequence of instructions.
+  Expr *ExpandAMDGPUPredicateBI(CallExpr *CE);
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erichkeane wrote:

```suggestion
  Expr *ExpandAMDGPUPredicateBuiltIn(CallExpr *CE);
```

https://github.com/llvm/llvm-project/pull/134016