a simple _Complex testcase

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@39836 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/complex.c

@@ -0,0 +1,10 @@
+// RUN: clang -emit-llvm %s
+// XFAIL: *
+
+void main(void)
+{
+  double _Complex a = 5;
+  double _Complex b = 42;
+
+  return a * b == 123;
+}