[clang] [clang] Implement -Walloc-size diagnostic option (PR #150028)

[via cfe-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions c,h,cpp -- clang/test/Sema/warn-alloc-size.c clang/include/clang/AST/Expr.h clang/lib/AST/Expr.cpp clang/lib/AST/ExprConstant.cpp clang/lib/Sema/SemaExpr.cpp clang/test/Analysis/Malloc+MismatchedDeallocator+NewDelete.cpp clang/test/Analysis/Malloc+MismatchedDeallocator_intersections.cpp clang/test/Analysis/NewDelete-checker-test.cpp clang/test/Analysis/castsize.c clang/test/Analysis/malloc-annotations.c clang/test/Analysis/malloc-sizeof.c clang/test/Analysis/malloc.c clang/test/Analysis/unix-fns.c clang/test/Sema/implicit-void-ptr-cast.c
``````````

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/clang/include/clang/AST/Expr.h b/clang/include/clang/AST/Expr.h
index d2ffe9c2e..662395095 100644
--- a/clang/include/clang/AST/Expr.h
+++ b/clang/include/clang/AST/Expr.h
@@ -40,25 +40,25 @@
 #include <optional>
 
 namespace clang {
-  class AllocSizeAttr;
-  class APValue;
-  class ASTContext;
-  class BlockDecl;
-  class CXXBaseSpecifier;
-  class CXXMemberCallExpr;
-  class CXXOperatorCallExpr;
-  class CastExpr;
-  class Decl;
-  class IdentifierInfo;
-  class MaterializeTemporaryExpr;
-  class NamedDecl;
-  class ObjCPropertyRefExpr;
-  class OpaqueValueExpr;
-  class ParmVarDecl;
-  class StringLiteral;
-  class TargetInfo;
-  class ValueDecl;
-  class WarnUnusedResultAttr;
+class AllocSizeAttr;
+class APValue;
+class ASTContext;
+class BlockDecl;
+class CXXBaseSpecifier;
+class CXXMemberCallExpr;
+class CXXOperatorCallExpr;
+class CastExpr;
+class Decl;
+class IdentifierInfo;
+class MaterializeTemporaryExpr;
+class NamedDecl;
+class ObjCPropertyRefExpr;
+class OpaqueValueExpr;
+class ParmVarDecl;
+class StringLiteral;
+class TargetInfo;
+class ValueDecl;
+class WarnUnusedResultAttr;
 
 /// A simple array of base specifiers.
 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;

``````````

</details>


https://github.com/llvm/llvm-project/pull/150028