[clang] [BitInt] Expose a _BitInt literal suffix in C++ (PR #86586)

[Aaron Ballman via cfe-commits]

================
@@ -1516,3 +1516,5 @@ def UnsafeBufferUsage : DiagGroup<"unsafe-buffer-usage", [UnsafeBufferUsageInCon
 // Warnings and notes InstallAPI verification.
 def InstallAPIViolation : DiagGroup<"installapi-violation">;
 
+// Warnings related to _BitInt extension 
+def BitIntExtension : DiagGroup<"bit-int-extension">;
----------------
AaronBallman wrote:

```suggestion
def BitIntExtension : DiagGroup<"bit-int-extension">;

```
Adding a newline back to the end of the file.


https://github.com/llvm/llvm-project/pull/86586