Revert r345562: "PR23833, DR2140: an lvalue-to-rvalue conversion on a glvalue of type"

This exposes a (known) CodeGen bug: it can't cope with emitting lvalue
expressions that denote non-odr-used but usable-in-constant-expression
variables. See PR39528 for a testcase.

Reverted for now until that issue can be fixed.

llvm-svn: 346065

1 files changed, 0 insertions, 41 deletions

diff --git a/clang/test/CodeGenCXX/nullptr.cpp b/clang/test/CodeGenCXX/nullptr.cpp
index 222e5e5803c..e93f7061bdd 100644
--- a/clang/test/CodeGenCXX/nullptr.cpp
+++ b/clang/test/CodeGenCXX/nullptr.cpp
@@ -22,44 +22,3 @@ void g() {
 const std::type_info& f2() {
   return typeid(nullptr_t);
 }
-
-union U {
-  int n;
-  nullptr_t b;
-};
-// CHECK-LABEL: define {{.*}}pr23833_a
-// CHECK: store
-// CHECK: load
-// CHECK-NOT: load
-// CHECK: ret i1 false
-bool pr23833_a(U &u) { return u.b; }
-
-// CHECK-LABEL: define {{.*}}pr23833_b
-// CHECK: store
-// CHECK: load
-// CHECK-NOT: load
-// CHECK: ret i8* null
-nullptr_t pr23833_b(nullptr_t &n) { return n; }
-
-struct X1 { operator int*(); };
-struct X2 { operator const nullptr_t&(); };
-
-// CHECK-LABEL: define {{.*}}pr23833_c
-// CHECK: call {{.*}}X1
-// CHECK: call {{.*}}X2
-// CHECK-NOT: load
-// CHECK: ret i32
-int pr23833_c() {
-  return X1() != X2();
-}
-
-// CHECK-LABEL: define {{.*}}pr23833_d
-// CHECK: call {{.*}}X2
-// CHECK-NOT: load
-// CHECK: store
-// CHECK: load
-// CHECK: ret i32*
-int *pr23833_d() {
-  int *p = X2();
-  return p;
-}