[OpenMP] Only test kmp_atomic_float10_max_min.c on X86

[tianshilei1992]

Summary

The test openmp/runtime/test/atomic/kmp_atomic_float10_max_min.c uses a compiler
flag -mlong-double-80 that might not be supported by all targets. Currently it
requires x86-registered-target, but that requirement can be true when LLVM
supports X86 while the actual libomp arch is not X86. For example, when LLVM
is built on AArch64 with all targets enabled, x86-registered-target can be met.
If libomp is built with native target, aka. AArch64, the test will still be enabled,
causing test failure.

This patch only enables the test if the actual target is X86. The actual target
is determined by LIBOMP_ARCH.

Fix #53696.

[jlpeyton]

LGTM

openmp/runtime/test/atomic/kmp_atomic_float10_max_min.c

 // RUN: %libomp-compile -mlong-double-80 && %libomp-run
 // UNSUPPORTED: gcc
-// REQUIRES: x86-registered-target
+// REQUIRES: x86-target-arch
 
 #include <stdio.h>
 #include <omp.h>
 
 // Used to detect architecture
 #include "../../src/kmp_platform.h"
 
 #ifdef  __cplusplus

openmp/runtime/test/lit.cfg

if config.operating_system == 'Darwin':
     config.available_features.add("darwin")
 
 if config.operating_system in ['Linux', 'Windows']:
     config.available_features.add('affinity')
 
 if config.operating_system in ['Linux']:
     config.available_features.add('hidden-helper')
 
+target_arch = getattr(config, 'target_arch', None)
+if target_arch:
+  config.available_features.add(target_arch + '-target-arch')
+  if target_arch in ['x86_64', 'i386']:
+    config.available_features.add('x86-target-arch')
+
 # Avoid Windows heuristics which try to detect potential installer programs
 # (which may need to run with elevated privileges) and ask if the user wants
 # to run them in that way. This heuristic may match for executables containing
 # the word "patch" which is a substring of "dispatch". Set an environment
 # variable indicating that we want to execute them with the current user.
 if config.operating_system == 'Windows':
     config.environment['__COMPAT_LAYER'] = 'RunAsInvoker'
 

openmp/runtime/test/lit.site.cfg.in

 config.operating_system = "@CMAKE_SYSTEM_NAME@"
 config.hwloc_library_dir = "@LIBOMP_HWLOC_LIBRARY_DIR@"
 config.using_hwloc = @LIBOMP_USE_HWLOC@
 config.has_ompt = @LIBOMP_OMPT_SUPPORT@ and @LIBOMP_OMPT_OPTIONAL@
 config.has_libm = @LIBOMP_HAVE_LIBM@
 config.has_libatomic = @LIBOMP_HAVE_LIBATOMIC@
 config.is_standalone_build = @OPENMP_STANDALONE_BUILD@
 config.has_omit_frame_pointer_flag = @OPENMP_TEST_COMPILER_HAS_OMIT_FRAME_POINTER_FLAGS@
+config.target_arch = "@LIBOMP_ARCH@"
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@LIBOMP_BASE_DIR@/test/lit.cfg")