[GlobalOpt] Simplify datalayout for test

There is no need to have a full AMDGPU data layout here, we just need a
different alloca and globals address space.

Author: arichardson

llvm/test/Transforms/GlobalOpt/global_alloca_diff_addrspaces.ll

@@ -1,6 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
 ; RUN: opt -S -passes=globalopt < %s | FileCheck %s
-target datalayout = "e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-p7:160:256:256:32-p8:128:128-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5-G1-ni:7:8:9"
+target datalayout = "A5-G1"
 
 ; Check that we don't convert the global into an alloca if their respective address
 ; spaces differ, and the alloca addrspace is non-zero.