[clang] [CLANG][AArch64] Add the modal 8 bit floating-point scalar type (PR #97277)

[Paul Walker via cfe-commits]

================
@@ -526,6 +526,11 @@ llvm::Type *CodeGenTypes::ConvertType(QualType T) {
       }
     case BuiltinType::SveCount:
       return llvm::TargetExtType::get(getLLVMContext(), "aarch64.svcount");
+    case BuiltinType::ArmMFloat8:
+      ResultType =
+          llvm::VectorType::get(llvm::Type::getInt8Ty(getLLVMContext()),
+                                llvm::ElementCount::getFixed(1));
+      break;
----------------
paulwalker-arm wrote:

Not sure how good an idea this is but what about updating 
`getBuiltinVectorTypeInfo` so the code above can be used? I mean, with the new 
definition mfloat8_t is effectively a vector type of sorts.

https://github.com/llvm/llvm-project/pull/97277
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