[clang] [Clang] Amend SME attributes with support for ZT0. (PR #77941)

[Aaron Ballman via cfe-commits]

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@@ -4068,7 +4075,7 @@ class FunctionType : public Type {
 
     /// Any AArch64 SME ACLE type attributes that need to be propagated
     /// on declarations and function pointers.
-    unsigned AArch64SMEAttributes : 6;
+    unsigned AArch64SMEAttributes : 8;
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AaronBallman wrote:

We could claw back these two bits by reducing `NumExceptionType` from 10 to 8.

https://github.com/llvm/llvm-project/pull/77941