Moved test and checking mir after last X86 pass

Author: jofrn

llvm/test/CodeGen/Generic/atomic-scalarization.ll

@@ -0,0 +1,16 @@
+; RUN: llc %s --mtriple=x86_64 -print-after=unpack-mi-bundles -disable-verify 2>&1 | FileCheck %s
+
+define i32 @atomic_scalar() {
+; CHECK: # *** IR Dump After Unpack machine instruction bundles (unpack-mi-bundles) ***:
+; CHECK-NEXT: # Machine code for function atomic_scalar: NoPHIs, TracksLiveness, NoVRegs, TiedOpsRewritten, TracksDebugUserValues
+; CHECK-NEXT: Frame Objects:
+; CHECK-NEXT:   fi#0: size=4, align=4, at location [SP-4]
+; CHECK:      bb.0 (%ir-block.0):
+; CHECK-NEXT:   renamable $eax = MOV32rm $rsp, 1, $noreg, -4, $noreg :: (dereferenceable load acquire (s32) from %ir.1)
+; CHECK-NEXT:   RET64 $eax
+; CHECK:      # End machine code for function atomic_scalar.
+  %1 = alloca <1 x i32>
+  %2 = load atomic <1 x i32>, ptr %1 acquire, align 4
+  %3 = extractelement <1 x i32> %2, i32 0
+  ret i32 %3
+}