[Fortran/gfortran][NFC] Recategorize tests

Move some disabled test to the "unsupported" category since there is no reasonable
way for those tests to be fixed. Recategorize other tests so their reasons for being
disabled are accurate.

---------

Co-authored-by: Tarun Prabhu <[email protected]>

Author: tarunprabhu

Fortran/gfortran/regression/DisabledFiles.cmake

@@ -119,6 +119,21 @@ file(GLOB UNSUPPORTED_FILES CONFIGURE_DEPENDS
   unlimited_polymorphic_14.f90
   # Unsupported predefined macro: __TIMESTAMP__
   wdate-time.F90
+
+  # This test checks that two arrays, initialized with random real numbers that
+  # are converted to integers, are not identical. It is possible, though
+  # unlikely for such "randomly initialized" arrays to be identical. Because of
+  # this inherent flakiness, this test will remain unsupported.
+  random_init_2.f90
+
+  # Test is not conformant as it writes to a constant argument
+  # Similar test, that is conformant, added to UnitTests/assign-goto
+  assign_5.f90
+
+  # Test is not conformant as it expects different value of cmdstat and cmdmsg
+  # Similar test added: UnitTests/execute_command_line
+  execute_command_line_1.f90
+  execute_command_line_3.f90
 )
 
 # These tests are skipped because they hit a 'not yet implemented' assertion
@@ -291,11 +306,6 @@ file(GLOB UNIMPLEMENTED_FILES CONFIGURE_DEPENDS
   # unimplemented: intrinsic: co_broadcast
   coarray_collectives_17.f90
 
-  # Test is not conformant as it expects different value of cmdstat and cmdmsg
-  # Similar test added: UnitTests/execute_command_line
-  execute_command_line_1.f90
-  execute_command_line_3.f90
-
   # unimplemented: intrinsic: failed_images
   coarray_failed_images_1.f08
 
@@ -1008,25 +1018,20 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   widechar_IO_4.f90
   zero_sized_1.f90
   elemental_function_2.f90
+  do_check_1.f90
+  random_3.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
   pr99210.f90
 
-  # These tests fail on Ubuntu because of a bug in the not utility. At least
-  # some of these should work once the issue with not has been fixed.
-  #
-  # https://github.com/llvm/llvm-test-suite/pull/102#issuecomment-1980674221
-  #
-  do_check_1.f90
+  # These tests go into an infinite loop printing "Hello World"
   pointer_check_1.f90
   pointer_check_2.f90
   pointer_check_3.f90
   pointer_check_4.f90
-  random_3.f90
-  unpack_bounds_1.f90
 
   # ---------------------------------------------------------------------------
   #
@@ -1050,6 +1055,7 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   no_unit_error_1.f90
   pointer_check_10.f90
   pointer_remapping_6.f08
+  unpack_bounds_1.f90
 
   # ---------------------------------------------------------------------------
   #
@@ -1408,10 +1414,6 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   directive_unroll_5.f90
   # Tests "!GCC$ attributes weak :: x"
   weak-3.f90
-  # Test is not conformant as it writes to a constant argument
-  # Similar test, that is conformant, added to UnitTests/assign-goto
-  assign_5.f90
-
 
   # Probable bugs
   # ["a", "ab"]
@@ -1793,9 +1795,6 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   # for the buildbot, this is disabled.
   internal_dummy_2.f08
 
-  # These are flaky tests, which may fail sometimes.
-  random_init_2.f90
-
   # The causes of failure of these tests need to be investigated
   PR113061.f90
   allocate_with_source_29.f90