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/CodeGenCXX/cxx1z-initializer-aggregate.cpp b/clang/test/CodeGenCXX/cxx1z-initializer-aggregate.cpp
index 1c92f5f..f59ec51 100644
--- a/clang/test/CodeGenCXX/cxx1z-initializer-aggregate.cpp
+++ b/clang/test/CodeGenCXX/cxx1z-initializer-aggregate.cpp
@@ -119,7 +119,7 @@
   template<int> B v({});
   template B v<0>;
   // CHECK-LABEL: define {{.*}}global_var_init{{.*}} comdat($_ZN13Instantiated11vILi0EEE) {
-  // CHECK: call void @_ZN13Instantiated11BC1Ev(%{{.*}}* noalias @_ZN13Instantiated11vILi0EEE)
+  // CHECK: call void @_ZN13Instantiated11BC1Ev(%{{.*}}* @_ZN13Instantiated11vILi0EEE)
 }
 
 namespace Instantiated2 {