[AArch64] Add MSVC mangling for the __mfp8 type (llvm#124968)

Fixes llvm#124907

(cherry picked from commit 7939ce6)

Author: momchil-velikov

clang/lib/AST/MicrosoftMangle.cpp

@@ -2792,6 +2792,10 @@ void MicrosoftCXXNameMangler::mangleType(const BuiltinType *T, Qualifiers,
     mangleArtificialTagType(TagTypeKind::Struct, "__bf16", {"__clang"});
     break;
 
+  case BuiltinType::MFloat8:
+    mangleArtificialTagType(TagTypeKind::Struct, "__mfp8", {"__clang"});
+    break;
+
 #define WASM_REF_TYPE(InternalName, MangledName, Id, SingletonId, AS)          \
   case BuiltinType::Id:                                                        \
     mangleArtificialTagType(TagTypeKind::Struct, MangledName);                 \
@@ -2808,6 +2812,7 @@ void MicrosoftCXXNameMangler::mangleType(const BuiltinType *T, Qualifiers,
 
 #define SVE_TYPE(Name, Id, SingletonId) \
   case BuiltinType::Id:
+#define SVE_SCALAR_TYPE(Name, MangledName, Id, SingletonId, Bits)
 #include "clang/Basic/AArch64SVEACLETypes.def"
 #define PPC_VECTOR_TYPE(Name, Id, Size) \
   case BuiltinType::Id:

clang/test/CodeGenCXX/aarch64-ms-mangle-mfp8.cpp

@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -triple aarch64-windows-msvc -emit-llvm -o - %s | FileCheck %s
+
+typedef __mfp8 mf8;
+typedef __attribute__((neon_vector_type(8))) __mfp8 mf8x8_t;
+typedef __attribute__((neon_vector_type(16))) __mfp8 mf8x16_t;
+
+// CHECK: "?f@@YAXU__mfp8@__clang@@@Z"
+void f(mf8 v) {}
+
+// CHECK: "?f@@YAXT?$__vector@U__mfp8@__clang@@$07@__clang@@@Z"
+void f(mf8x8_t v) {}
+
+// CHECK: "?f@@YAXT?$__vector@U__mfp8@__clang@@$0BA@@__clang@@@Z"
+void f(mf8x16_t v) {}