[SVE] Eliminate calls to default-false VectorType::get() from Utils

[ctetreau]

rebase

llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp

static void insertSinCosCall(IRBuilderBase &B, Function *OrigCallee, Value *Arg,
   Triple T(OrigCallee->getParent()->getTargetTriple());
   if (UseFloat) {
     Name = "__sincospif_stret";
 
     assert(T.getArch() != Triple::x86 && "x86 messy and unsupported for now");
     // x86_64 can't use {float, float} since that would be returned in both
     // xmm0 and xmm1, which isn't what a real struct would do.
     ResTy = T.getArch() == Triple::x86_64
-                ? static_cast<Type *>(VectorType::get(ArgTy, 2))
+                ? static_cast<Type *>(FixedVectorType::get(ArgTy, 2))
                 : static_cast<Type *>(StructType::get(ArgTy, ArgTy));
   } else {
     Name = "__sincospi_stret";
     ResTy = StructType::get(ArgTy, ArgTy);
   }
 
   Module *M = OrigCallee->getParent();
   FunctionCallee Callee =