[AIX] change "llvm-ar" to "env OBJECT_MODE=any llvm-ar" in clang/test for AIX OS

[DiggerLin]

Summary

In patch https://reviews.llvm.org/D127864. we add a new option -X for AIX OS, and default value is -X32. In order not effect the test cases in clang/test. we need to change "llvm-ar" to "env OBJECT_MODE=any llvm-ar" in clang/test for AIX OS

[Jake-Egan]

LGTM

clang/test/Driver/linker-wrapper-libs.c

 // REQUIRES: x86-registered-target
 // REQUIRES: nvptx-registered-target
 // REQUIRES: amdgpu-registered-target
 
-// REQUIRES: system-linux
-
 // RUN: %clang -cc1 %s -triple x86_64-unknown-linux-gnu -emit-obj -o %t.elf.o
 
 #if defined(RESOLVES)
 int __attribute__((visibility("hidden"))) sym;
 #elif defined(GLOBAL)
 int __attribute__((visibility("protected"))) global;
 #elif defined(WEAK)
 int __attribute__((visibility("hidden"))) weak;

clang/test/lit.cfg.py

 # controls the kind of objects they will support. If there is no "OBJECT_MODE"
 # environment variable specified, the default behaviour is to support 32-bit
 # objects only. In order to not affect most test cases, which expect to support
 # 32-bit and 64-bit objects by default, set the environment variable
 # "OBJECT_MODE" to 'any' for llvm-nm on AIX OS.
 
 if 'system-aix' in config.available_features:
         config.substitutions.append(('llvm-nm', 'env OBJECT_MODE=any llvm-nm'))
+        config.substitutions.append(('llvm-ar', 'env OBJECT_MODE=any llvm-ar'))
 
 # It is not realistically possible to account for all options that could
 # possibly be present in system and user configuration files, so disable
 # default configs for the test runs.
 config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"