[EVM][ISel] Select (setcc x, 0, ne) as ISZERO ISZERO

Before the patch it was selected as `PUSH0 EQ ISZERO`.

Author: akiramenai

llvm/lib/Target/EVM/EVMInstrInfo.td

@@ -338,6 +338,7 @@ def : Pat<(setcc GPR:$rs0, GPR:$rs1, SETULE),
 def : Pat<(setcc GPR:$rs0, GPR:$rs1, SETUGE),
           (ISZERO (ULT GPR:$rs0, GPR:$rs1))>;
 
+def : Pat<(setcc GPR:$rs0, 0, SETNE), (ISZERO (ISZERO GPR:$rs0))>;
 
 //===----------------------------------------------------------------------===//
 // EVM bitwise instructions.

llvm/test/CodeGen/EVM/jumps-are-expensive.ll

@@ -11,12 +11,10 @@ define i256 @test(i256 %a, i256 %b) {
 ; CHECK:       ; %bb.0: ; %bb1
 ; CHECK-NEXT:    JUMPDEST
 ; CHECK-NEXT:    SWAP1
-; CHECK-NEXT:    PUSH0
-; CHECK-NEXT:    EQ
+; CHECK-NEXT:    ISZERO
 ; CHECK-NEXT:    ISZERO
 ; CHECK-NEXT:    SWAP1
-; CHECK-NEXT:    PUSH0
-; CHECK-NEXT:    EQ
+; CHECK-NEXT:    ISZERO
 ; CHECK-NEXT:    ISZERO
 ; CHECK-NEXT:    AND
 ; CHECK-NEXT:    PUSH4 @.BB0_2

llvm/test/CodeGen/EVM/setcc-with-0-selection.ll

@@ -18,8 +18,7 @@ define i1 @test_ne(i256 %x) {
 ; CHECK-LABEL: test_ne:
 ; CHECK:       ; %bb.0:
 ; CHECK-NEXT:    JUMPDEST
-; CHECK-NEXT:    PUSH0
-; CHECK-NEXT:    EQ
+; CHECK-NEXT:    ISZERO
 ; CHECK-NEXT:    ISZERO
 ; CHECK-NEXT:    SWAP1
 ; CHECK-NEXT:    JUMP