Add test.

Author: abidh

flang/test/Integration/debug-complex-2.f90

@@ -0,0 +1,12 @@
+! RUN: %flang_fc1 -emit-llvm -debug-info-kind=standalone %s -o - | FileCheck  %s
+
+! Test that complex return type is correctly represented in debug.
+complex function fn(a)
+    complex, intent(in) :: a
+    fn = a
+end function
+
+! CHECK-DAG: ![[CMPLX:.*]] = !DIBasicType(name: "complex", size: 64, encoding: DW_ATE_complex_float)
+! CHECK-DAG: ![[SR_TY:.*]] = !DISubroutineType(cc: DW_CC_normal, types: ![[TYPES:.*]])
+! CHECK-DAG: ![[TYPES]] = !{![[CMPLX]], ![[CMPLX]]}
+! CHECK-DAG: !DISubprogram(name: "fn"{{.*}}type: ![[SR_TY]]{{.*}})