[clang] [llvm] [clang] Use separator for large numeric values in overflow diagnostic (PR #80939)

[Aaron Ballman via cfe-commits]

================
@@ -2257,17 +2266,27 @@ void APInt::toString(SmallVectorImpl<char> &Str, 
unsigned Radix, bool Signed,
     unsigned ShiftAmt = (Radix == 16 ? 4 : (Radix == 8 ? 3 : 1));
     unsigned MaskAmt = Radix - 1;
 
+    int Pos = 0;
     while (Tmp.getBoolValue()) {
       unsigned Digit = unsigned(Tmp.getRawData()[0]) & MaskAmt;
+      if (insertSeparators && Pos % Grouping == 0 && Pos > 0) {
+        Str.push_back('\'');
+      }
----------------
AaronBallman wrote:

Same here as above

https://github.com/llvm/llvm-project/pull/80939
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