Update failing AMDGPU tests

Update some failing AMDGPU tests using maxnum's updated sNaN behaviour
and maximumnum's new set of optimizations.

Author: LewisCrawford

llvm/test/CodeGen/AMDGPU/fcanonicalize-elimination.ll

@@ -497,12 +497,10 @@ define amdgpu_kernel void @test_fold_canonicalize_minnum_value_f32(ptr addrspace
   ret void
 }
 
-; FIXME: Should there be more checks here? minnum with NaN operand is simplified away.
+; FIXME: Should there be more checks here? minnum with sNaN operand is simplified to qNaN.
 
 ; GCN-LABEL: test_fold_canonicalize_sNaN_value_f32:
-; GCN: {{flat|global}}_load_dword [[LOAD:v[0-9]+]]
-; VI: v_mul_f32_e32 v{{[0-9]+}}, 1.0, [[LOAD]]
-; GFX9: v_max_f32_e32 v{{[0-9]+}}, [[LOAD]], [[LOAD]]
+; GCN: v_mov_b32_e32 v{{.+}}, 0x7fc00000
 define amdgpu_kernel void @test_fold_canonicalize_sNaN_value_f32(ptr addrspace(1) %arg) {
   %id = tail call i32 @llvm.amdgcn.workitem.id.x()
   %gep = getelementptr inbounds float, ptr addrspace(1) %arg, i32 %id

llvm/test/CodeGen/AMDGPU/fneg-combines.new.ll

@@ -2055,8 +2055,7 @@ define float @v_fneg_self_minimumnum_f32_ieee(float %a) #0 {
 ; GCN-LABEL: v_fneg_self_minimumnum_f32_ieee:
 ; GCN:       ; %bb.0:
 ; GCN-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
-; GCN-NEXT:    v_mul_f32_e32 v0, -1.0, v0
-; GCN-NEXT:    v_max_f32_e32 v0, v0, v0
+; GCN-NEXT:    v_xor_b32_e32 v0, 0x80000000, v0
 ; GCN-NEXT:    s_setpc_b64 s[30:31]
   %min = call float @llvm.minimumnum.f32(float %a, float %a)
   %min.fneg = fneg float %min
@@ -2391,8 +2390,7 @@ define float @v_fneg_self_maximumnum_f32_ieee(float %a) #0 {
 ; GCN-LABEL: v_fneg_self_maximumnum_f32_ieee:
 ; GCN:       ; %bb.0:
 ; GCN-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
-; GCN-NEXT:    v_mul_f32_e32 v0, -1.0, v0
-; GCN-NEXT:    v_min_f32_e32 v0, v0, v0
+; GCN-NEXT:    v_xor_b32_e32 v0, 0x80000000, v0
 ; GCN-NEXT:    s_setpc_b64 s[30:31]
   %max = call float @llvm.maximumnum.f32(float %a, float %a)
   %max.fneg = fneg float %max