[llvm] [TLI] Use the VFABI demangling when declaring vector variants. (PR #76753)

[Alexandros Lamprineas via llvm-commits]

================
@@ -37,20 +37,39 @@ STATISTIC(NumCompUsedAdded,
 /// vectorizes the CallInst CI with a vectorization factor of VF
 /// lanes. The TLI assumes that all parameters and the return type of
 /// CI (other than void) need to be widened to a VectorType of VF
-/// lanes.
+/// lanes unless the VFABI says otherwise.
 static void addVariantDeclaration(CallInst &CI, const ElementCount &VF,
-                                  bool Predicate, const StringRef VFName) {
+                                  const VecDesc *VD) {
   Module *M = CI.getModule();
 
   // Add function declaration.
   Type *RetTy = ToVectorTy(CI.getType(), VF);
----------------
labrinea wrote:

It does work, but I've replaced the whole block of code with `VFABI:createFunctionType` as suggested.

https://github.com/llvm/llvm-project/pull/76753