Handle returning complex types that get coerced. Fixes PR3131

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60058 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/complex.c b/test/CodeGen/complex.c
index 93e25cf..9c0e3d5 100644
--- a/test/CodeGen/complex.c
+++ b/test/CodeGen/complex.c
@@ -51,3 +51,10 @@
   __complex__ long long v = 2;
 }
 
+// PR3131
+float _Complex t4();
+
+void t5() {
+  float _Complex x = t4();
+}
+