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

[Jon Roelofs via cfe-commits]

================
@@ -68,13 +68,15 @@ int __attribute__((target_version(""))) unsup1(void) { 
return 1; }
 void __attribute__((target_version("crc32"))) unsup2(void) {}
 
 void __attribute__((target_version("default+fp16"))) koo(void) {}
+//expected-error@-1 {{function multiversioning doesn't support feature 
'default'}}
 void __attribute__((target_version("default+default+default"))) loo(void) {}
+//expected-error@-1 {{function multiversioning doesn't support feature 
'default'}}
----------------
jroelofs wrote:

Maybe this should get its own diagnostic. I could see that phrasing being 
really confusing.

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