Don't fixit/recover from -Wstatic-float-init when it's not an error.

Fix to change r173414 that lead to Clang changing const to constexpr even under
-Wno-static-float-init.

llvm-svn: 173835
diff --git a/clang/test/SemaCXX/cxx0x-class.cpp b/clang/test/SemaCXX/cxx0x-class.cpp
index 5532bce..4e0d5bc 100644
--- a/clang/test/SemaCXX/cxx0x-class.cpp
+++ b/clang/test/SemaCXX/cxx0x-class.cpp
@@ -17,11 +17,11 @@
 };
 
 namespace rdar8367341 {
-  float foo(); // expected-note 2{{here}}
+  float foo(); // expected-note {{here}}
 
   struct A {
     static const float x = 5.0f; // expected-warning {{requires 'constexpr'}}
-    static const float y = foo(); // expected-warning {{requires 'constexpr'}} expected-error {{constexpr variable 'y' must be initialized by a constant expression}} expected-note {{non-constexpr function 'foo'}}
+    static const float y = foo(); // expected-warning {{requires 'constexpr'}}
     static constexpr float x2 = 5.0f;
     static constexpr float y2 = foo(); // expected-error {{must be initialized by a constant expression}} expected-note {{non-constexpr function 'foo'}}
   };