[turbofan] Introduce new operators Float32SubPreserveNan and Float64SubPreserveNan for wasm.

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

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index 057912902f32134bfc44b3b73772a3a1a73e63f7..e72de53b1e3cdca335ee3f120939eed0e26f1e80 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -581,6 +581,21 @@ TEST(Run_WasmFloat32Neg) {
   }
 }
 
+TEST(Run_WasmFloat32SubMinusZero) {
+  WasmRunner<float> r(MachineType::Float32());
+  BUILD(r, WASM_F32_SUB(WASM_F32(-0.0), WASM_GET_LOCAL(0)));
+
+  CHECK_EQ(0x7fe00000, bit_cast<uint32_t>(r.Call(bit_cast<float>(0x7fa00000))));
+}
+
+TEST(Run_WasmFloat64SubMinusZero) {
+  WasmRunner<double> r(MachineType::Float64());
+  BUILD(r, WASM_F64_SUB(WASM_F64(-0.0), WASM_GET_LOCAL(0)));
+
+  CHECK_EQ(0x7ff8123456789abc,
+           bit_cast<uint64_t>(r.Call(bit_cast<double>(0x7ff0123456789abc))));
+}
+
 TEST(Run_WasmFloat64Neg) {
   WasmRunner<double> r(MachineType::Float64());
   BUILD(r, WASM_F64_NEG(WASM_GET_LOCAL(0)));