Revert "[CodeGenCXX] Treat 'this' as noalias in constructors"

This reverts commit https://reviews.llvm.org/rL344150 which causes
MachineOutliner related failures on the ppc64le multistage buildbot.

llvm-svn: 344526
diff --git a/clang/test/OpenMP/parallel_num_threads_codegen.cpp b/clang/test/OpenMP/parallel_num_threads_codegen.cpp
index d03d785..79615b9 100644
--- a/clang/test/OpenMP/parallel_num_threads_codegen.cpp
+++ b/clang/test/OpenMP/parallel_num_threads_codegen.cpp
@@ -49,7 +49,7 @@
 // CHECK-DAG:   [[S_ADDR:%.+]] = alloca [[S_TY]]
 // CHECK-DAG:   [[A_ADDR:%.+]] = alloca i8
 // CHECK-DAG:   [[GTID:%.+]] = call {{.*}}i32 @__kmpc_global_thread_num([[IDENT_T_TY]]* [[DEF_LOC_2]])
-// CHECK-DAG:   call {{.*}} [[S_TY_CONSTR:@.+]]([[S_TY]]* noalias [[S_ADDR]], [[INTPTR_T_TY]] [[INTPTR_T_TY_ATTR:(signext )?]]0)
+// CHECK-DAG:   call {{.*}} [[S_TY_CONSTR:@.+]]([[S_TY]]* [[S_ADDR]], [[INTPTR_T_TY]] [[INTPTR_T_TY_ATTR:(signext )?]]0)
 // CHECK:       [[S_CHAR_OP:%.+]] = invoke{{.*}} i8 [[S_TY_CHAR_OP:@.+]]([[S_TY]]* [[S_ADDR]])
 // CHECK:       store i8 [[S_CHAR_OP]], i8* [[A_ADDR]]
 // CHECK:       call {{.*}}void @__kmpc_push_num_threads([[IDENT_T_TY]]* [[DEF_LOC_2]], i32 [[GTID]], i32 2)
@@ -77,7 +77,7 @@
 // CHECK:       [[GTID:%.+]] = call {{.*}}i32 @__kmpc_global_thread_num([[IDENT_T_TY]]* [[DEF_LOC_2]])
 // CHECK:       call {{.*}}void @__kmpc_push_num_threads([[IDENT_T_TY]]* [[DEF_LOC_2]], i32 [[GTID]], i32 1)
 // CHECK:       call {{.*}}void {{.*}} @__kmpc_fork_call(
-// CHECK:       {{(invoke|call)}} {{.*}} [[S_TY_CONSTR]]([[S_TY]]* noalias [[S_TEMP:%.+]], [[INTPTR_T_TY]] [[INTPTR_T_TY_ATTR]]23)
+// CHECK:       {{(invoke|call)}} {{.*}} [[S_TY_CONSTR]]([[S_TY]]* [[S_TEMP:%.+]], [[INTPTR_T_TY]] [[INTPTR_T_TY_ATTR]]23)
 // CHECK:       [[S_CHAR_OP:%.+]] = invoke{{.*}} i8 [[S_TY_CHAR_OP]]([[S_TY]]* [[S_TEMP]])
 // CHECK:       [[RES:%.+]] = sext {{.*}}i8 [[S_CHAR_OP]] to i32
 // CHECK:       call {{.*}}void @__kmpc_push_num_threads([[IDENT_T_TY]]* [[DEF_LOC_2]], i32 [[GTID]], i32 [[RES]])