(1) remove useless code (2) update one test file.

Author: jwanggit86

llvm/lib/Target/AMDGPU/GCNSubtarget.cpp

@@ -623,9 +623,6 @@ GCNUserSGPRUsageInfo::GCNUserSGPRUsageInfo(const Function &F,
       DispatchID = true;
   }
 
-  const bool IsNoFlatScratchInitSet =
-      F.hasFnAttribute("amdgpu-no-flat-scratch-init");
-
   if (ST.hasFlatAddressSpace() && AMDGPU::isEntryFunctionCC(CC) &&
       (IsAmdHsaOrMesa || ST.enableFlatScratch()) &&
       // FlatScratchInit cannot be true for graphics CC if enableFlatScratch()

llvm/test/CodeGen/AMDGPU/udiv.ll

@@ -256,8 +256,8 @@ define amdgpu_kernel void @s_udiv_i32(ptr addrspace(1) %out, i32 %a, i32 %b) {
 ; GCN:       ; %bb.0:
 ; GCN-NEXT:    s_load_dwordx4 s[0:3], s[8:9], 0x0
 ; GCN-NEXT:    s_add_i32 s12, s12, s17
-; GCN-NEXT:    s_mov_b32 flat_scratch_lo, s13
 ; GCN-NEXT:    s_lshr_b32 flat_scratch_hi, s12, 8
+; GCN-NEXT:    s_mov_b32 flat_scratch_lo, s13
 ; GCN-NEXT:    s_waitcnt lgkmcnt(0)
 ; GCN-NEXT:    v_cvt_f32_u32_e32 v0, s3
 ; GCN-NEXT:    s_sub_i32 s4, 0, s3