[fortran] Disable some gfortran tests that non-determinstically fail when testing in parallel

[tarunprabhu]

Summary

Several gfortran tests read/write/delete the same file. When running the test suite in parallel, this results in non-deterministic test failures since the tests race on the file. This disables several tests that have such implicit race conditions.

A better approach would be to have the tests run in their own temporary directory, or to have lit run just those tests serially. I will look into those options and put up a patch. This is to quickly work around the non-deterministic failures in the buildbots such as (among several others):

https://lab.llvm.org/buildbot/#/builders/197/builds/4630
https://lab.llvm.org/buildbot/#/builders/197/builds/4640

[kiranchandramohan]

Approving since this fixes the buildbots.

Fortran/gfortran/regression/CMakeLists.txt

file(GLOB Failing CONFIGURE_DEPENDS
   widechar_intrinsics_8.f90
   write_check.f90
   zero_sized_1.f90
 
   # These tests fail at runtime on AArch64 (but pass on x86). Disable them
   # anyway so the test-suite passes by default on AArch64.
   entry_23.f
   findloc_8.f90
+
+  # These tests have race conditions with other tests that cause them to
+  # occasionally fail when run in parallel. Every test in each group listed
+  # below has a race condition with at least one other test in the group.
+
+  # <group> Tests read/write/replace/delete file named 'tmp.dat'
+  pr88169_1.f90
+  pr88169_2.f90
+  pr88169_3.f90
+  list_read_6.f90
+  # </group>
+
+  # <group>
+  write_rewind_1.f
+  write_rewind_2.f
+  # </group>
+
+  # <group> Tests read/delete/append file named 'foo'
+  append_1.f90
+  large_unit_2.f90
+  open_access_append_1.f90
+  open_status_1.f90
+  # </group>
+
+  # <group> Tests create/replace file named 'test.dat'
+  direct_io_12.f90
+  endfile.f90
+  eof_4.f90
+  implied_do_io_1.f90
+  list_read_7.f90
+  namelist_76.f90
+  read_eof_8.f90
+  read_eof_all.f90
+  streamio_18.f90
+  # </group>
 )
 
 list(APPEND UnsupportedTests "${Unsupported}")
 list(APPEND UnimplementedTests "${Unimplemented}")
 list(APPEND SkippedTests "${Skipped}")
 list(APPEND FailingTests "${Failing}")
 
 # add_tests will find all files with known Fortran extensions, pick out the ones