[ROCm] Use portable compiler names in cpp_extension compatibility tests (pytorch#188580) (#3384)

Use util function to get compiler executable names instead of hardcoded
`g++`

Pull Request resolved: pytorch#188580
Approved by: https://github.com/jeffdaily

(cherry picked from commit e6e48bf)

Author: zjliu-amd

test/cpp_extensions/libtorch_agn_2_10_extension/test_version_compatibility.py

@@ -24,6 +24,7 @@
 from torch.testing._internal.common_utils import IS_WINDOWS, run_tests, TestCase
 from torch.utils.cpp_extension import (
     CUDA_HOME,
+    get_cxx_compiler,
     include_paths as torch_include_paths,
     ROCM_HOME,
 )
@@ -83,7 +84,7 @@ def _compile_cpp_file(
             torch_version_2_9 = "0x0209000000000000"
 
             cmd = [
-                "g++",
+                get_cxx_compiler(),
                 "-c",
                 "-std=c++17",
                 f"-DTORCH_TARGET_VERSION={torch_version_2_9}",