[wasm] Backoff implementation for F64Trunc using std::trunc.

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/wasm/wasm-macro-gen.h"
 
@@ skipping 2988 matching lines @@
 
 
 TEST(Run_Wasm_F64Ceil) {
   WasmRunner<double> r(MachineType::Float64());
   BUILD(r, WASM_F64_CEIL(WASM_GET_LOCAL(0)));
 
   FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(ceil(*i), r.Call(*i)); }
 }
 
 
-TEST(Run_Wasm_F64Trunc) {
-  WasmRunner<double> r(MachineType::Float64());
-  BUILD(r, WASM_F64_TRUNC(WASM_GET_LOCAL(0)));
-
-  FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(trunc(*i), r.Call(*i)); }
-}
-
-
 TEST(Run_Wasm_F64NearestInt) {
   WasmRunner<double> r(MachineType::Float64());
   BUILD(r, WASM_F64_NEARESTINT(WASM_GET_LOCAL(0)));
 
   FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(nearbyint(*i), r.Call(*i)); }
 }
 
 #endif
 
+TEST(Run_Wasm_F64Trunc) {
+  WasmRunner<double> r(MachineType::Float64());
+  BUILD(r, WASM_F64_TRUNC(WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(trunc(*i), r.Call(*i)); }
+}
 
 TEST(Run_Wasm_F32Min) {
   WasmRunner<float> r(MachineType::Float32(), MachineType::Float32());
   BUILD(r, WASM_F32_MIN(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
 
   FOR_FLOAT32_INPUTS(i) {
     FOR_FLOAT32_INPUTS(j) {
       float expected;
       if (*i < *j) {
         expected = *i;
@@ skipping 300 matching lines @@
 
 #if WASM_64
 TEST(Compile_Wasm_CallIndirect_Many_i64) { CompileCallIndirectMany(kAstI64); }
 #endif
 
 
 TEST(Compile_Wasm_CallIndirect_Many_f32) { CompileCallIndirectMany(kAstF32); }
 
 
 TEST(Compile_Wasm_CallIndirect_Many_f64) { CompileCallIndirectMany(kAstF64); }