[interpreter] Elide OSR polling from fake loops.

src/interpreter/control-flow-builders.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/control-flow-builders.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
@@ skipping 84 matching lines @@
   // requirements of bytecode basic blocks. The only entry into a loop
   // must be the loop header. Surely breaks is okay? Not if nested
   // and misplaced between the headers.
   DCHECK(break_sites_.empty() && continue_sites_.empty());
   builder()->Bind(&loop_header_);
   for (auto& label : *additional_labels) {
     builder()->Bind(loop_header_, &label);
   }
 }
 
-
-void LoopBuilder::EndLoop() {
+void LoopBuilder::JumpToHeader() {
   // Loop must have closed form, i.e. all loop elements are within the loop,
   // the loop header precedes the body and next elements in the loop.
   DCHECK(loop_header_.is_bound());
+  builder()->Jump(&loop_header_);
+}
+
+void LoopBuilder::JumpToHeaderIfTrue() {
+  // Loop must have closed form, i.e. all loop elements are within the loop,
+  // the loop header precedes the body and next elements in the loop.
+  DCHECK(loop_header_.is_bound());
+  builder()->JumpIfTrue(&loop_header_);
+}
+
+void LoopBuilder::EndLoop() {
   builder()->Bind(&loop_end_);
   SetBreakTarget(loop_end_);
 }
 
 void LoopBuilder::SetContinueTarget() {
   BytecodeLabel target;
   builder()->Bind(&target);
   BindLabels(target, &continue_sites_);
 }
 
@@ skipping 59 matching lines @@
 }
 
 
 void TryFinallyBuilder::EndFinally() {
   // Nothing to be done here.
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8