add integration test

Author: jeanPerier

flang/test/Integration/abi-indirect-call.f90

@@ -0,0 +1,15 @@
+!REQUIRES: x86-registered-target
+!REQUIRES: flang-supports-f128-math
+!RUN: %flang_fc1 -emit-llvm -triple x86_64-unknown-linux-gnu %s -o - | FileCheck  %s
+
+! Test ABI of indirect calls is properly implemented in the LLVM IR.
+
+subroutine foo(func_ptr, z)
+  interface
+    complex(16) function func_ptr()
+    end function
+  end interface
+  complex(16) :: z
+  ! CHECK: call void %{{.*}}(ptr sret({ fp128, fp128 }) align 16 %{{.*}})
+  z = func_ptr()
+end subroutine