Add testcase for correct sret handling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35562 91177308-0d34-0410-b5e6-96231b3b80d8

test/CFrontend/sret.c

@@ -0,0 +1,15 @@
+// RUN: %llvmgcc %s -S -emit-llvm -O0 -o - | grep 'sret' | wc -l | grep '5'
+
+struct abc {
+ int a;
+ int b;
+ int c;
+};
+ 
+struct abc foo1(void);
+struct abc foo2();
+
+void bar() {
+  struct abc dummy1 = foo1();
+  struct abc dummy2 = foo2();
+}