[clang] [Clang][Sema] Switch diagnostics from toString to operator<< for APSInt/APInt (PR #161474)

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


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/lib/Sema/SemaChecking.cpp clang/test/AST/ByteCode/const-eval.c clang/test/Sema/const-eval.c clang/test/Sema/integer-overflow.c clang/test/Sema/unbounded-array-bounds.c clang/test/SemaCXX/array-bounds.cpp clang/test/SemaCXX/constant-expression-cxx14.cpp clang/test/SemaCXX/integer-overflow.cpp
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 020e496c2..38e94095b 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -14883,14 +14883,12 @@ void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
 
       // Diag message shows element size in bits and in "bytes" (platform-
       // dependent CharUnits)
-      DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
-                          PDiag(DiagID)
-                              << index << AddrBits
-                              << (unsigned)ASTC.toBits(*ElemCharUnits)
-                              << ElemBytes
-                              << MaxElems
-                              << (unsigned)MaxElems.getLimitedValue(~0U)
-                              << IndexExpr->getSourceRange());
+      DiagRuntimeBehavior(
+          BaseExpr->getBeginLoc(), BaseExpr,
+          PDiag(DiagID) << index << AddrBits
+                        << (unsigned)ASTC.toBits(*ElemCharUnits) << ElemBytes
+                        << MaxElems << (unsigned)MaxElems.getLimitedValue(~0U)
+                        << IndexExpr->getSourceRange());
 
       const NamedDecl *ND = nullptr;
       // Try harder to find a NamedDecl to point at in the note.

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https://github.com/llvm/llvm-project/pull/161474