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

src/compiler/wasm-linkage.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/assembler.h"
 #include "src/macro-assembler.h"
 
 #include "src/wasm/wasm-module.h"
 
 #include "src/compiler/linkage.h"
@@ skipping 246 matching lines @@
     msig.AddParam(MachineTypeFor(param));
     locations.AddParam(params.Next(param));
   }
 
   const RegList kCalleeSaveRegisters = 0;
   const RegList kCalleeSaveFPRegisters = 0;
 
   // The target for WASM calls is always a code object.
   MachineType target_type = MachineType::AnyTagged();
   LinkageLocation target_loc = LinkageLocation::ForAnyRegister();
+
   return new (zone) CallDescriptor(       // --
       CallDescriptor::kCallCodeObject,    // kind
       target_type,                        // target MachineType
       target_loc,                         // target location
       msig.Build(),                       // machine_sig
       locations.Build(),                  // location_sig
       params.stack_offset,                // stack_parameter_count
       compiler::Operator::kNoProperties,  // properties
       kCalleeSaveRegisters,               // callee-saved registers
       kCalleeSaveFPRegisters,             // callee-saved fp regs
       CallDescriptor::kUseNativeStack,    // flags
       "c-call");
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8