[wasm] Enable I64Neq on 32 bit platforms.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1724193003

Cr-Commit-Position: refs/heads/master@{#34279}

src/compiler/wasm-compiler.cc

@@ -511,6 +511,8 @@ Node* WasmGraphBuilder::Binop(wasm::WasmOpcode opcode, Node* left,
       op = m->Word64Equal();
       break;
 // kExprI64Ne:
+    case wasm::kExprI64Ne:
+      return Invert(Binop(wasm::kExprI64Eq, left, right));
 // kExprI64LtS:
 // kExprI64LeS:
 // kExprI64LtU:
@@ -598,8 +600,6 @@ Node* WasmGraphBuilder::Binop(wasm::WasmOpcode opcode, Node* left,
     case wasm::kExprI64ShrS:
       op = m->Word64Sar();
       break;
-    case wasm::kExprI64Ne:
-      return Invert(Binop(wasm::kExprI64Eq, left, right));
     case wasm::kExprI64LtS:
       op = m->Int64LessThan();
       break;

test/cctest/wasm/test-run-wasm-64.cc

@@ -62,6 +62,13 @@ TEST(Run_WasmI64Eq) {
   }
 }
 // kExprI64Ne:
+TEST(Run_WasmI64Ne) {
+  WasmRunner<int32_t> r(MachineType::Int64(), MachineType::Int64());
+  BUILD(r, WASM_I64_NE(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+  FOR_INT64_INPUTS(i) {
+    FOR_INT64_INPUTS(j) { CHECK_EQ(*i != *j ? 1 : 0, r.Call(*i, *j)); }
+  }
+}
 // kExprI64LtS:
 // kExprI64LeS:
 // kExprI64LtU: