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

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/base/platform/elapsed-timer.h"
 
@@ skipping 563 matching lines @@
 TEST(Run_WasmFloat32Neg) {
   WasmRunner<float> r(MachineType::Float32());
   BUILD(r, WASM_F32_NEG(WASM_GET_LOCAL(0)));
 
   FOR_FLOAT32_INPUTS(i) {
     CHECK_EQ(0x80000000,
              bit_cast<uint32_t>(*i) ^ bit_cast<uint32_t>(r.Call(*i)));
   }
 }
 
+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)));
 
   FOR_FLOAT64_INPUTS(i) {
     CHECK_EQ(0x8000000000000000,
              bit_cast<uint64_t>(*i) ^ bit_cast<uint64_t>(r.Call(*i)));
   }
 }
 
@@ skipping 2146 matching lines @@
   WasmRunner<int32_t> r(MachineType::Int32(), MachineType::Int32());
   BUILD(r, WASM_I32_REMS(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)), WASM_ZERO);
   const int32_t kMin = std::numeric_limits<int32_t>::min();
   CHECK_EQ(0, r.Call(133, 100));
   CHECK_EQ(0, r.Call(kMin, -1));
   CHECK_EQ(0, r.Call(0, 1));
   CHECK_TRAP(r.Call(100, 0));
   CHECK_TRAP(r.Call(-1001, 0));
   CHECK_TRAP(r.Call(kMin, 0));
 }