Enable FeatureFlatForGlobal on Volcanic Islands

This switches to the workaround that HSA defaults to
for the mesa path.

This should be applied to the 4.0 branch.

Patch by Vedran Miletić <vedran@miletic.net>

llvm-svn: 292982
diff --git a/llvm/test/CodeGen/AMDGPU/seto.ll b/llvm/test/CodeGen/AMDGPU/seto.ll
index 9b5d6b5..01e4a7fd 100644
--- a/llvm/test/CodeGen/AMDGPU/seto.ll
+++ b/llvm/test/CodeGen/AMDGPU/seto.ll
@@ -1,5 +1,5 @@
 ; RUN: llc -march=amdgcn -mcpu=verde -verify-machineinstrs < %s | FileCheck %s
-; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck %s
+; RUN: llc -march=amdgcn -mcpu=tonga -mattr=-flat-for-global -verify-machineinstrs < %s | FileCheck %s
 
 ; CHECK-LABEL: {{^}}main:
 ; CHECK: v_cmp_o_f32_e64 [[CMP:s\[[0-9]+:[0-9]+\]]], [[SREG:s[0-9]+]], [[SREG]]