[libomptarget][nfc] Only set cuda-path for nvptx tests

[JonChesterfield]

Summary

Remove --cuda-path=CUDA_TOOLKIT_ROOT_DIR-NOTFOUND
from the invocation of non-nvptx test cases. Better signal
to noise ratio on other architectures.

[JonChesterfield]

openmp/libomptarget/test/lit.cfg

66

same predicate (and indent) as up here

[tianshilei1992]

LG

openmp/libomptarget/test/lit.cfg

if config.libomptarget_debug:
   config.available_features.add('libomptarget-debug')
 
 config.available_features.add(config.libomptarget_current_target)
 
 # Determine whether the test system supports unified memory.
 # For CUDA, this is the case with compute capability 70 (Volta) or higher.
 # For all other targets, we currently assume it is.
 supports_unified_shared_memory = True
 if config.libomptarget_current_target.startswith('nvptx'):
   try:
     cuda_arch = int(config.cuda_test_arch)
     if cuda_arch < 70:
       supports_unified_shared_memory = False
   except ValueError:
     # If the architecture is invalid, assume it is supported.
     supports_unified_shared_memory = True
 if supports_unified_shared_memory:
else:
         config.substitutions.append(("%clangxx-" + libomptarget_target, \
             "echo ignored-command"))
         config.substitutions.append(("%fcheck-" + libomptarget_target, \
             "echo ignored-command"))
 
 config.substitutions.append(("%clangxx", config.test_cxx_compiler))
 config.substitutions.append(("%clang", config.test_c_compiler))
 config.substitutions.append(("%openmp_flags", config.test_openmp_flags))
-if config.cuda_path:
+if config.libomptarget_current_target.startswith('nvptx') and config.cuda_path:
     config.substitutions.append(("%cuda_flags", "--cuda-path=" + config.cuda_path))
 else:
     config.substitutions.append(("%cuda_flags", ""))
 config.substitutions.append(("%flags", config.test_flags))
 config.substitutions.append(("%not", config.libomptarget_not))