[flang][OpenMP] Fix ignore-target-data.f90 test

Allow the function definition line to match with and without attrbute
set number.

This fixes build break after PR144534:
https://lab.llvm.org/buildbot/#/builders/157/builds/31331

Also move the test to the OpenMP subdirectory where it should have
been from the beginning.

Author: kparzysz

flang/test/Lower/ignore-target-data.f90 renamed to flang/test/Lower/OpenMP/ignore-target-data.f90

@@ -6,7 +6,7 @@
 !NORT-NOT: call{{.*}}__tgt_target_data_end_mapper
 
 !Make sure we generate the body
-!LLVM: define internal void @_QFPf(ptr %[[A0:[0-9]+]], ptr %[[A1:[0-9]+]]) {
+!LLVM: define internal void @_QFPf(ptr %[[A0:[0-9]+]], ptr %[[A1:[0-9]+]])
 !LLVM:   %[[V0:[0-9]+]] = load i32, ptr %[[A0]], align 4
 !LLVM:   %[[V1:[0-9]+]] = load i32, ptr %[[A1]], align 4
 !LLVM:   %[[V2:[0-9]+]] = add i32 %[[V0]], %[[V1]]