IBM Power (ppc64le) support

[sumitd2]

...
//test/unit/utils:utils_tests_test_0                                     PASSED in 0.3s
//test/unit/utils:utils_tests_test_1                                     PASSED in 0.2s
//test/unit/utils:utils_tests_test_2                                     PASSED in 0.4s
//test/unit/utils:utils_tests_test_3                                     PASSED in 0.3s
//test/unit/utils:utils_tests_test_4                                     PASSED in 0.3s
//test/unit/versioned_libs:linux_no_version_test                         PASSED in 0.4s
//test/unit/versioned_libs:linux_suffix_version_test                     PASSED in 0.3s
//test/unit/versioned_libs:versioned_libs_unit_test_suite_test_0         PASSED in 0.3s
//test/versioned_dylib:versioned_dylib_test                              PASSED in 0.4s
//tools/runfiles:runfiles_test                                           PASSED in 0.4s
//tools/rust_analyzer:gen_rust_project_lib_test                          PASSED in 0.5s
//util/label:label_test                                                  PASSED in 0.4s
//util/process_wrapper:process_wrapper_test                              PASSED in 0.5s

Executed 321 out of 341 tests: 321 tests pass and 20 were skipped.

[sumitd2]

cc: @seth-priya