[clang] [clang][bytecode] Cache Is(Unnamed)BitFields bools in `Record::Field` (PR #221392)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>

We need to query those a lot and we can save them in the padding bytes of `Record::Field`.

---
Full diff: https://github.com/llvm/llvm-project/pull/221392.diff


1 Files Affected:

- (modified) clang/lib/AST/ByteCode/Record.h (+8-3) 


``````````diff
diff --git a/clang/lib/AST/ByteCode/Record.h b/clang/lib/AST/ByteCode/Record.h
index 536bc319bde22..a32ac5d14bf81 100644
--- a/clang/lib/AST/ByteCode/Record.h
+++ b/clang/lib/AST/ByteCode/Record.h
@@ -29,16 +29,21 @@ class Record final {
     const FieldDecl *Decl;
     const Descriptor *Desc;
     unsigned Offset;
+    bool IsBitField;
+    bool IsUnnamedBitField;
 
-    bool isBitField() const { return Decl->isBitField(); }
-    bool isUnnamedBitField() const { return Decl->isUnnamedBitField(); }
+    bool isBitField() const { return IsBitField; }
+    bool isUnnamedBitField() const { return IsUnnamedBitField; }
     unsigned bitWidth() const {
       assert(isBitField());
       return Decl->getBitWidthValue();
     }
 
     Field(const FieldDecl *D, const Descriptor *Desc, unsigned Offset)
-        : Decl(D), Desc(Desc), Offset(Offset) {}
+        : Decl(D), Desc(Desc), Offset(Offset) {
+      IsBitField = Decl->isBitField();
+      IsUnnamedBitField = IsBitField && Decl->isUnnamedBitField();
+    }
   };
 
   /// Describes a base class.

``````````

</details>


https://github.com/llvm/llvm-project/pull/221392