[clang] [Clang][NFC] Use const ASTContext reference in Decl Create methods (PR #185401)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/AST/Decl.h clang/lib/AST/Decl.cpp clang/lib/AST/DeclCXX.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/AST/Decl.h b/clang/include/clang/AST/Decl.h
index 6b8f53658..736558c1c 100644
--- a/clang/include/clang/AST/Decl.h
+++ b/clang/include/clang/AST/Decl.h
@@ -138,9 +138,7 @@ public:
   using redeclarable_base::redecls_begin;
   using redeclarable_base::redecls_end;
 
-  ASTContext &getASTContext() const {
-    return const_cast<ASTContext &>(Ctx);
-  }
+  ASTContext &getASTContext() const { return const_cast<ASTContext &>(Ctx); }
 
   NamespaceDecl *getAnonymousNamespace() const { return AnonymousNamespace; }
   void setAnonymousNamespace(NamespaceDecl *D);

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https://github.com/llvm/llvm-project/pull/185401