[wasm] Int64Lowering of Int64Mul 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 d38d192d634cdb67f8e1def08df4e0ae275e0ed9..cd3f4aa428ff4ce120077867377b0a845d51ed8e 100644
--- a/test/cctest/wasm/test-run-wasm-64.cc
+++ b/test/cctest/wasm/test-run-wasm-64.cc
@@ -48,7 +48,7 @@
   V(I64LoadStore, true)         \
   V(I64Add, !MIPS_OR_X87)       \
   V(I64Sub, !MIPS_OR_X87)       \
-  V(I64Mul, false)              \
+  V(I64Mul, !MIPS_OR_X87)       \
   V(I64DivS, true)              \
   V(I64DivU, true)              \
   V(I64RemS, true)              \
@@ -873,6 +873,8 @@ TEST(Run_Wasm_I64Binops) {
   TEST_I64_BINOP(I64Add, 8888888888888LL, 3333333333333LL, 5555555555555LL);
   TEST_I64_BINOP(I64Sub, -111111111111LL, 777777777777LL, 888888888888LL);
   TEST_I64_BINOP(I64Mul, 65130756, 88734, 734);
+  TEST_I64_BINOP(I64Mul, 65130756, -88734, -734);
+  TEST_I64_BINOP(I64Mul, -65130756, -88734, 734);
   TEST_I64_BINOP(I64DivS, -66, -4777344, 72384);
   TEST_I64_BINOP(I64DivU, 805306368, 0xF0000000, 5);
   TEST_I64_BINOP(I64RemS, -3, -3003, 1000);