[wasm] Int64Lowering of Int64Sub on ia32 and arm.

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

Index: test/cctest/wasm/test-run-wasm-64.cc
diff --git a/test/cctest/wasm/test-run-wasm-64.cc b/test/cctest/wasm/test-run-wasm-64.cc
index afa918aabf532ccecd6ef3e40c5bb51b915e86b4..3105ebd28f77c8ef95d83630a91aa1028dd0d724 100644
--- a/test/cctest/wasm/test-run-wasm-64.cc
+++ b/test/cctest/wasm/test-run-wasm-64.cc
@@ -41,12 +41,13 @@
 
 #define FOREACH_I64_OPERATOR(V) \
   V(DepthFirst, true)           \
+  V(I64Phi, false)              \
   V(I64Const, true)             \
   V(I64Return, true)            \
   V(I64Param, true)             \
   V(I64LoadStore, true)         \
   V(I64Add, !MIPS_OR_X87)       \
-  V(I64Sub, false)              \
+  V(I64Sub, !MIPS_OR_X87)       \
   V(I64Mul, false)              \
   V(I64DivS, true)              \
   V(I64DivU, true)              \
@@ -137,6 +138,14 @@ TEST(Run_WasmI64Add) {
   }
 }
 // kExprI64Sub:
+TEST(Run_Wasm_I64Sub) {
+  REQUIRE(I64Sub);
+  WasmRunner<int64_t> r(MachineType::Int64(), MachineType::Int64());
+  BUILD(r, WASM_I64_SUB(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+  FOR_INT64_INPUTS(i) {
+    FOR_INT64_INPUTS(j) { CHECK_EQ(*i - *j, r.Call(*i, *j)); }
+  }
+}
 // kExprI64Mul:
 // kExprI64DivS:
 
@@ -1241,6 +1250,7 @@ TEST(Run_Wasm_MemI64_Sum) {
   REQUIRE(I64LoadStore);
   REQUIRE(I64Add);
   REQUIRE(I64Sub);
+  REQUIRE(I64Phi);
   const int kNumElems = 20;
   TestingModule module;
   uint64_t* memory = module.AddMemoryElems<uint64_t>(kNumElems);