[AMDGPU] Remove exit-on-error flag from test (PR27762)

[rovka]

Summary

Similar to r269948, but for argument lowering.

Fixes PR27762

[rovka]

The change is for SI; AFAICT R600 doesn't need such a change (and anyway the test doesn't seem to cover it). Please let me know if I got things wrong.

[arsenm]

LGTM.

Can you add check lines for the other functions, since these should each emit the error

lib/Target/AMDGPU/SIISelLowering.cpp

SDValue SITargetLowering::LowerFormalArguments(
   SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
   const AMDGPUSubtarget &ST = MF.getSubtarget<AMDGPUSubtarget>();
 
   if (Subtarget->isAmdHsaOS() && AMDGPU::isShader(CallConv)) {
     const Function *Fn = MF.getFunction();
     DiagnosticInfoUnsupported NoGraphicsHSA(
         *Fn, "unsupported non-compute shaders with HSA", DL.getDebugLoc());
     DAG.getContext()->diagnose(NoGraphicsHSA);
-    return SDValue();
+    return DAG.getEntryNode();
   }
 
   SmallVector<ISD::InputArg, 16> Splits;
   BitVector Skipped(Ins.size());
 
   for (unsigned i = 0, e = Ins.size(), PSInputNum = 0; i != e; ++i) {
     const ISD::InputArg &Arg = Ins[i];
 

test/CodeGen/AMDGPU/no-hsa-graphics-shaders.ll

-; RUN: not llc -march=amdgcn -mtriple=amdgcn-unknown-amdhsa -exit-on-error < %s 2>&1 | FileCheck %s
+; RUN: not llc -march=amdgcn -mtriple=amdgcn-unknown-amdhsa < %s 2>&1 | FileCheck %s
 
 ; CHECK: in function pixel_s{{.*}}: unsupported non-compute shaders with HSA
 define amdgpu_ps void @pixel_shader() #0 {
   ret void
 }
 
 define amdgpu_vs void @vertex_shader() #0 {
   ret void
 }
 
 define amdgpu_gs void @geometry_shader() #0 {
   ret void
 }