[compiler] Remove support for concurrent OSR.

src/full-codegen/full-codegen.cc

 // Copyright 2012 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/full-codegen/full-codegen.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 1765 matching lines @@
       PatchAt(unoptimized, back_edges.pc(i), INTERRUPT, patch);
     }
   }
 
   unoptimized->set_allow_osr_at_loop_nesting_level(0);
   // Assert that none of the back edges are patched anymore.
   DCHECK(Verify(isolate, unoptimized));
 }
 
 
-void BackEdgeTable::AddStackCheck(Handle<Code> code, uint32_t pc_offset) {
-  DisallowHeapAllocation no_gc;
-  Isolate* isolate = code->GetIsolate();
-  Address pc = code->instruction_start() + pc_offset;
-  Code* patch = isolate->builtins()->builtin(Builtins::kOsrAfterStackCheck);
-  PatchAt(*code, pc, OSR_AFTER_STACK_CHECK, patch);
-}
-
-
-void BackEdgeTable::RemoveStackCheck(Handle<Code> code, uint32_t pc_offset) {
-  DisallowHeapAllocation no_gc;
-  Isolate* isolate = code->GetIsolate();
-  Address pc = code->instruction_start() + pc_offset;
-
-  if (OSR_AFTER_STACK_CHECK == GetBackEdgeState(isolate, *code, pc)) {
-    Code* patch = isolate->builtins()->builtin(Builtins::kOnStackReplacement);
-    PatchAt(*code, pc, ON_STACK_REPLACEMENT, patch);
-  }
-}
-
-
 #ifdef DEBUG
 bool BackEdgeTable::Verify(Isolate* isolate, Code* unoptimized) {
   DisallowHeapAllocation no_gc;
   int loop_nesting_level = unoptimized->allow_osr_at_loop_nesting_level();
   BackEdgeTable back_edges(unoptimized, &no_gc);
   for (uint32_t i = 0; i < back_edges.length(); i++) {
     uint32_t loop_depth = back_edges.loop_depth(i);
     CHECK_LE(static_cast<int>(loop_depth), Code::kMaxLoopNestingMarker);
     // Assert that all back edges for shallower loops (and only those)
     // have already been patched.
@@ skipping 112 matching lines @@
   return var->mode() == CONST_LEGACY || var->scope()->is_nonlinear() ||
          var->initializer_position() >= proxy->position();
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8