[AMDGPU] Fix a urem combine test to test what it was supposed to

Author: jayfoad

llvm/test/CodeGen/AMDGPU/GlobalISel/combine-urem-pow-2.mir

@@ -48,12 +48,14 @@ body:             |
 
     ; GCN-LABEL: name: urem_s32_var_const2
     ; GCN: liveins: $vgpr0
-    ; GCN: %const:_(s32) = G_CONSTANT i32 1
+    ; GCN: %var:_(s32) = COPY $vgpr0
+    ; GCN: %const:_(s32) = G_CONSTANT i32 2
     ; GCN: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 -1
     ; GCN: [[ADD:%[0-9]+]]:_(s32) = G_ADD %const, [[C]]
-    ; GCN: $vgpr0 = COPY [[ADD]](s32)
+    ; GCN: %rem:_(s32) = G_AND %var, [[ADD]]
+    ; GCN: $vgpr0 = COPY %rem(s32)
     %var:_(s32) = COPY $vgpr0
-    %const:_(s32) = G_CONSTANT i32 1
+    %const:_(s32) = G_CONSTANT i32 2
     %rem:_(s32) = G_UREM %var, %const
     $vgpr0 = COPY %rem
 ...