[GlobalOpt] Use target triple to fix Buildbot failures, NFCI (#169260)

This supposes to fix LLVM Buildbot failures after #164768. I don't have
the environment to verify though.

Author: phoebewang

llvm/test/Transforms/GlobalOpt/X86/apx.ll

@@ -1,5 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
-; RUN: opt -mtriple=x86_64 -S -passes=globalopt -o - < %s | FileCheck %s
+; RUN: opt -S -passes=globalopt -o - < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
 
 define void @caller1() {
 ; CHECK-LABEL: define void @caller1() local_unnamed_addr {