Add simplistic test

Author: mjklemm

flang/test/Lower/OpenMP/missing-inode.f90

@@ -0,0 +1,8 @@
+! RUN: %flang_fc1 -emit-llvm -fopenmp -fopenmp-version=51 -fopenmp-targets=amdgcn-amd-amdhsa -o - %s | FileCheck %s
+program missing_inode
+#line "/this_path_should_not_exist_on_any_system_out_there/and_if_it_does_it_will_break_the/tes.f90" 700
+    ! CHECK:  define internal void @__omp_offloading_{{[0-9a-f]+}}_{{[0-9a-f]+}}__QQmain_l701
+    !$omp target
+        call some_routine()
+    !$omp end target
+end program missing_inode