Unrevert r147271, reverted in r147361.

Also temporarily remove the assumption from IR gen that we can emit IR for every
constant we can fold, since it isn't currently true in C++11, to fix PR11676.

Original comment from r147271:

constexpr: perform zero-initialization prior to / instead of performing a
constructor call when appropriate. Thanks to Eli for spotting this.

llvm-svn: 147384

1 files changed, 5 insertions, 2 deletions

diff --git a/clang/test/SemaCXX/constexpr-printing.cpp b/clang/test/SemaCXX/constexpr-printing.cpp
index e6cf209819a..cccefca9fa0 100644
--- a/clang/test/SemaCXX/constexpr-printing.cpp
+++ b/clang/test/SemaCXX/constexpr-printing.cpp
@@ -11,8 +11,11 @@ struct S {
 
 constexpr int extract(const S &s) { return s.n; } // expected-note {{read of uninitialized object is not allowed in a constant expression}}
 
-constexpr S s1; // expected-error {{constant expression}} expected-note {{in call to 'S()'}}
-constexpr S s2(10);
+constexpr S s1; // ok
+void f() {
+  constexpr S s1; // expected-error {{constant expression}} expected-note {{in call to 'S()'}}
+  constexpr S s2(10);
+}
 
 typedef __attribute__((vector_size(16))) int vector_int;