[Hexagon] Fix isTypeForHVX to recognize floating point types

Co-authored-by: Sumanth Gundapaneni <sgundapa@quicinc.com>

llvm/lib/Target/Hexagon/HexagonSubtarget.cpp

@@ -228,7 +228,9 @@ bool HexagonSubtarget::isTypeForHVX(Type *VecTy, bool IncludeBool) const {
   if (!VecTy->isVectorTy() || isa<ScalableVectorType>(VecTy))
     return false;
   // Avoid types like <2 x i32*>.
-  if (!cast<VectorType>(VecTy)->getElementType()->isIntegerTy())
+  Type *ScalTy = VecTy->getScalarType();
+  if (!ScalTy->isIntegerTy() &&
+      !(ScalTy->isFloatingPointTy() && useHVXFloatingPoint()))
     return false;
   // The given type may be something like <17 x i32>, which is not MVT,
   // but can be represented as (non-simple) EVT.

llvm/test/CodeGen/Hexagon/autohvx/calling-conv.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -march=hexagon < %s | FileCheck %s
+; RUN: llc -march=hexagon -hexagon-vector-combine=false < %s | FileCheck %s
 
 define void @f0(<128 x i8> %a0, <128 x i8>* %a1) #0 {
 ; CHECK-LABEL: f0: