[clang] [NFC] Reduce size of FunctionEffect to 1 byte. (PR #100753)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Doug Wyatt (dougsonos)

<details>
<summary>Changes</summary>

As a preliminary to PR https://github.com/llvm/llvm-project/pull/99656 , reduce the size of `FunctionEffect` to 1 byte.

---
Full diff: https://github.com/llvm/llvm-project/pull/100753.diff


1 Files Affected:

- (modified) clang/include/clang/AST/Type.h (+3-3) 


``````````diff
diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
index 25defea58c2dc..cb345c3028909 100644
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -4699,16 +4699,16 @@ class FunctionEffect {
 
 private:
   LLVM_PREFERRED_TYPE(Kind)
-  unsigned FKind : 3;
+  uint8_t FKind : 3;
 
   // Expansion: for hypothetical TCB+types, there could be one Kind for TCB,
   // then ~16(?) bits "SubKind" to map to a specific named TCB. SubKind would
   // be considered for uniqueness.
 
 public:
-  FunctionEffect() : FKind(unsigned(Kind::None)) {}
+  FunctionEffect() : FKind(uint8_t(Kind::None)) {}
 
-  explicit FunctionEffect(Kind K) : FKind(unsigned(K)) {}
+  explicit FunctionEffect(Kind K) : FKind(uint8_t(K)) {}
 
   /// The kind of the effect.
   Kind kind() const { return Kind(FKind); }

``````````

</details>


https://github.com/llvm/llvm-project/pull/100753