Replace std::trunc() with trunc() to support cross-compiling

src/runtime/runtime-simd.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 "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/base/macros.h"
 #include "src/conversions.h"
 #include "src/factory.h"
 #include "src/objects-inl.h"
 
 // Implement Single Instruction Multiple Data (SIMD) operations as defined in
 // the SIMD.js draft spec:
 // http://littledan.github.io/simd.html
 
 namespace v8 {
 namespace internal {
 
 namespace {
 
 // Functions to convert Numbers to SIMD component types.
 
 template <typename T, typename F>
 static bool CanCast(F from) {
   // A float can't represent 2^31 - 1 or 2^32 - 1 exactly, so promote the limits
   // to double. Otherwise, the limit is truncated and numbers like 2^31 or 2^32
   // get through, causing any static_cast to be undefined.
-  from = std::trunc(from);
+  from = trunc(from);
   return from >= static_cast<double>(std::numeric_limits<T>::min()) &&
          from <= static_cast<double>(std::numeric_limits<T>::max());
 }
 
 
 // Explicitly specialize for conversions to float, which always succeed.
 template <>
 bool CanCast<float>(int32_t from) {
   return true;
 }
@@ skipping 967 matching lines @@
 SIMD_LOADN_STOREN_TYPES(SIMD_LOAD3_FUNCTION)
 SIMD_NUMERIC_TYPES(SIMD_STORE_FUNCTION)
 SIMD_LOADN_STOREN_TYPES(SIMD_STORE1_FUNCTION)
 SIMD_LOADN_STOREN_TYPES(SIMD_STORE2_FUNCTION)
 SIMD_LOADN_STOREN_TYPES(SIMD_STORE3_FUNCTION)
 
 //-------------------------------------------------------------------
 
 }  // namespace internal
 }  // namespace v8