[PowerPC] Enhance test for PR45297. NFC.

Author: Kai Luo

llvm/test/CodeGen/PowerPC/pr45297.ll

@@ -1,10 +1,13 @@
-; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu \
-; RUN:   -mattr=+altivec -mattr=-power8-vector -mattr=-vsx < %s | FileCheck %s
-; XFAIL: *
+; RUN: not --crash llc -verify-machineinstrs \
+; RUN:   -mtriple=powerpc64le-unknown-linux-gnu -mattr=+altivec \
+; RUN:   -mattr=-power8-vector -mattr=-vsx < %s 2>&1 | FileCheck %s
+; CHECK: LLVM ERROR: Cannot select: t{{[0-9]+}}: 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 {
 entry:
   %1 = fptosi float %0 to i32
-  store i32 %1, i32* undef, align 4
+  store i32 %1, i32* @Global, align 4
   ret void
 }