[turbofan] Add basic support for calling to (a subset of) C functions.

src/compiler/instruction-selector.cc

 // Copyright 2014 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/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
@@ skipping 318 matching lines @@
   switch (buffer->descriptor->kind()) {
     case CallDescriptor::kCallCodeObject:
       buffer->instruction_args.push_back(
           (call_code_immediate && callee->opcode() == IrOpcode::kHeapConstant)
               ? g.UseImmediate(callee)
               : g.UseRegister(callee));
       break;
     case CallDescriptor::kCallAddress:
       buffer->instruction_args.push_back(
           (call_address_immediate &&
-           (callee->opcode() == IrOpcode::kInt32Constant ||
-            callee->opcode() == IrOpcode::kInt64Constant))
+           callee->opcode() == IrOpcode::kExternalConstant)
               ? g.UseImmediate(callee)
               : g.UseRegister(callee));
       break;
     case CallDescriptor::kCallJSFunction:
       buffer->instruction_args.push_back(
           g.UseLocation(callee, buffer->descriptor->GetInputLocation(0),
                         buffer->descriptor->GetInputType(0)));
       break;
   }
   DCHECK_EQ(1u, buffer->instruction_args.size());
@@ skipping 804 matching lines @@
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::Flag::kNoFlags;
 }
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8