[EVM] Add pre-commit test for Prefer to emit PUSH0 over a DUP

Signed-off-by: Vladimir Radosavljevic <[email protected]>

Author: vladimirradosavljevic

llvm/test/CodeGen/EVM/push0-over-dup.ll

@@ -0,0 +1,16 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "E-p:256:256-i256:256:256-S256-a:256:256"
+target triple = "evm"
+
+define { i256, i256 } @test() {
+; CHECK-LABEL: test:
+; CHECK:       ; %bb.0:
+; CHECK-NEXT:    JUMPDEST
+; CHECK-NEXT:    PUSH0
+; CHECK-NEXT:    DUP1
+; CHECK-NEXT:    SWAP2
+; CHECK-NEXT:    JUMP
+  ret { i256, i256 } zeroinitializer
+}