[interpreter] Add explicit OSR polling bytecode.

src/interpreter/bytecode-array-builder.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/interpreter/bytecode-array-builder.h"
 
 #include "src/compiler.h"
 #include "src/globals.h"
 #include "src/interpreter/bytecode-array-writer.h"
 #include "src/interpreter/bytecode-dead-code-optimizer.h"
@@ skipping 452 matching lines @@
     // A Nop could be inserted for empty statements, but since no code
     // is associated with these positions, instead we force the stack
     // check's expression position which eliminates the empty
     // statement's position.
     latest_source_info_.ForceExpressionPosition(position);
   }
   Output(Bytecode::kStackCheck);
   return *this;
 }
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::OsrPoll(int loop_depth) {
+  Output(Bytecode::kOsrPoll, UnsignedOperand(loop_depth));
+  return *this;
+}
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::Throw() {
   Output(Bytecode::kThrow);
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::ReThrow() {
   Output(Bytecode::kReThrow);
   return *this;
 }
 
@@ skipping 466 matching lines @@
       return Bytecode::kTailCall;
     default:
       UNREACHABLE();
   }
   return Bytecode::kIllegal;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8