Fix tests to match data movement instead of stack allocation

Author: winstonallo

tests/assembly-llvm/reg-struct-return.rs

@@ -55,7 +55,8 @@ mod Small {
 
         // WITHOUT-LABEL: small_caller
         // WITHOUT: calll small
-        // WITHOUT: subl $4, %esp
+        // WITHOUT: movzwl {{.*}}(%esp), %e[[TMP:..]]
+        // WITHOUT: movw %[[TMP]], (%e{{..}})
         *dst = small();
     }
 }
@@ -98,7 +99,8 @@ mod Pivot {
 
         // WITHOUT-LABEL: pivot_caller
         // WITHOUT: calll pivot
-        // WITHOUT: subl $4, %esp
+        // WITHOUT: movsd {{.*}}(%esp), %[[TMP:xmm.]]
+        // WITHOUT: movsd %[[TMP]], (%e{{..}})
         *dst = pivot();
     }
 }
@@ -133,7 +135,10 @@ mod Large {
     pub unsafe extern "C" fn large_caller(dst: &mut LargeStruct) {
         // CHECK-LABEL: large_caller
         // CHECK: calll large
-        // CHECK: subl $4, %esp
+        // CHECK-DAG: movl   {{.*}}(%esp), %[[TMP1:e..]]
+        // CHECK-DAG: movl  %[[TMP1]], {{.*}}(%e{{..}})
+        // CHECK-DAG: movsd  {{.*}}(%esp), %[[TMP2:xmm.]]
+        // CHECK-DAG: movsd  %[[TMP2]], {{.*}}(%e{{..}})
         *dst = large();
     }
 }