[clang] [FMV] Allow multi versioning without default declaration. (PR #85454)

[Jon Roelofs via cfe-commits]

================
@@ -483,14 +483,16 @@ void just_fine(void) {}
 
 __arm_locally_streaming
 __attribute__((target_version("sme2")))
-void just_fine_locally_streaming(void) {}
+void incompatible_locally_streaming(void) {}
+// expected-error@-1 {{attribute 'target_version' multiversioning cannot be 
combined with attribute '__arm_locally_streaming'}}
+// expected-cpp-error@-2 {{attribute 'target_version' multiversioning cannot 
be combined with attribute '__arm_locally_streaming'}}
----------------
jroelofs wrote:

I missed this before... why?

cc @sdesmalen-arm 

https://github.com/llvm/llvm-project/pull/85454
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