[PowerPC] Don't generate ST_VSR_SCAL_INT if power8-vector is disabled

Summary:
In https://bugs.llvm.org/show_bug.cgi?id=45297, it fails selecting
instructions for `PPCISD::ST_VSR_SCAL_INT`. The reason it generate the
`PPCISD::ST_VSR_SCAL_INT` with `-power8-vector` in IR is PPC's
combiner checks `hasP8Altivec` rather than `hasP8Vector`. This patch
should resolve PR45297.

Differential Revision: https://reviews.llvm.org/D76773

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

@@ -13768,7 +13768,7 @@ SDValue PPCTargetLowering::combineStoreFPToInt(SDNode *N,
         (Op1VT == MVT::i32 || Op1VT == MVT::i64 ||
          (Subtarget.hasP9Vector() && (Op1VT == MVT::i16 || Op1VT == MVT::i8)));
 
-  if (ResVT == MVT::ppcf128 || !Subtarget.hasP8Altivec() ||
+  if (ResVT == MVT::ppcf128 || !Subtarget.hasP8Vector() ||
       cast<StoreSDNode>(N)->isTruncatingStore() || !ValidTypeForStoreFltAsInt)
     return SDValue();
 

llvm/test/CodeGen/PowerPC/pr45297.ll

@@ -1,11 +1,20 @@
-; RUN: not --crash llc -verify-machineinstrs \
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -ppc-asm-full-reg-names \
 ; RUN:   -mtriple=powerpc64le-unknown-linux-gnu -mattr=+altivec \
 ; RUN:   -mattr=-power8-vector -mattr=-vsx < %s 2>&1 | FileCheck %s
-; CHECK: LLVM ERROR: Cannot select: {{.*}}: ch = PPCISD::ST_VSR_SCAL_INT<(store 4 into @Global)>
 
 @Global = dso_local global i32 55, align 4
 
 define dso_local void @test(float %0) local_unnamed_addr {
+; CHECK-LABEL: test:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    fctiwz f0, f1
+; CHECK-NEXT:    addi r3, r1, -4
+; CHECK-NEXT:    addis r4, r2, Global@toc@ha
+; CHECK-NEXT:    stfiwx f0, 0, r3
+; CHECK-NEXT:    lwz r3, -4(r1)
+; CHECK-NEXT:    stw r3, Global@toc@l(r4)
+; CHECK-NEXT:    blr
 entry:
   %1 = fptosi float %0 to i32
   store i32 %1, i32* @Global, align 4