[clang] [AST] Remove an unnecessary cast (NFC) (PR #151278)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

getSignificantBits() already returns unsigned.


---
Full diff: https://github.com/llvm/llvm-project/pull/151278.diff


1 Files Affected:

- (modified) clang/include/clang/AST/ASTContext.h (+1-1) 


``````````diff
diff --git a/clang/include/clang/AST/ASTContext.h b/clang/include/clang/AST/ASTContext.h
index 0273109f8a698..3b98274a80420 100644
--- a/clang/include/clang/AST/ASTContext.h
+++ b/clang/include/clang/AST/ASTContext.h
@@ -1818,7 +1818,7 @@ class ASTContext : public RefCountedBase<ASTContext> {
         NumPositiveBits = std::max({NumPositiveBits, ActiveBits, 1u});
       } else {
         NumNegativeBits =
-            std::max(NumNegativeBits, (unsigned)InitVal.getSignificantBits());
+            std::max(NumNegativeBits, InitVal.getSignificantBits());
       }
 
       MembersRepresentableByInt &= isRepresentableIntegerValue(InitVal, IntTy);

``````````

</details>


https://github.com/llvm/llvm-project/pull/151278