[Flang] Fix failing plugin tests

[awarzynski]

Summary

Adds missing items in the list the REQUIRERS list. These tests were
originally added in https://reviews.llvm.org/D109890 and are currently
causing some buildbots to fail.

[clementval]

Solve the problem on my side.

[ijan1]

LGTM. Thanks for the fix.

[awarzynski]

Merged.

Note that there was a missing dependency in flang/test/CMakeLists.txt too. I took the liberty of adding that before pushing this change into main. It's an obvious oversight that you would only notice with FLANG_BUILD_EXAMPLES set to On. I hope that that's OK and apologies for the disruption.

flang/test/CMakeLists.txt

if (FLANG_INCLUDE_TESTS)
   if (FLANG_GTEST_AVAIL)
     list(APPEND FLANG_TEST_DEPENDS FlangUnitTests)
   endif()
 endif()
 
 if (FLANG_BUILD_EXAMPLES)
   list(APPEND FLANG_TEST_DEPENDS
     flangPrintFunctionNames
+    flangOmpReport
     )
 endif ()
 
 add_custom_target(flang-test-depends DEPENDS ${FLANG_TEST_DEPENDS})
 
 add_lit_testsuite(check-flang "Running the Flang regression tests"
   ${CMAKE_CURRENT_BINARY_DIR}
   PARAMS ${FLANG_TEST_PARAMS}

flang/test/Examples/omp-atomic.f90

 ! Check the flang-omp-report plugin for omp-atomic.f90
 
-! REQUIRES: plugins
+! REQUIRES: plugins, examples, shell
 
 ! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 ! Check OpenMP 2.13.6 atomic Construct
 
   a = 1.0
   !$omp parallel num_threads(4) shared(a)
   !$omp atomic seq_cst, read

flang/test/Examples/omp-declarative-directive.f90

 ! Check the flang-omp-report plugin for omp-declarative-directive.f90
 
-! REQUIRES: plugins
+! REQUIRES: plugins, examples, shell
 
 ! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 ! Check OpenMP declarative directives
 
 ! 2.8.2 declare-simd
 
 subroutine declare_simd_1(a, b)

flang/test/Examples/omp-device-constructs.f90

 ! Check flang-omp-report --femit-yaml for omp-device-constructs.f90
 
-! REQUIRES: plugins
+! REQUIRES: plugins, examples, shell
 
 !RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 ! Check OpenMP clause validity for the following directives:
 !     2.10 Device constructs
 program main
 
   real(8) :: arrayA(256), arrayB(256)