[compiler] Remove support for concurrent OSR.

src/full-codegen/arm64/full-codegen-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 4153 matching lines @@
       //  <decrement profiling counter>
       //  .. .. .. ..       b.pl ok
       //  .. .. .. ..       ldr x16, pc+<interrupt stub address>
       //  .. .. .. ..       blr x16
       //  ... more instructions.
       //  ok-label
       // Jump offset is 6 instructions.
       patcher.b(6, pl);
       break;
     case ON_STACK_REPLACEMENT:
-    case OSR_AFTER_STACK_CHECK:
       //  <decrement profiling counter>
       //  .. .. .. ..       mov x0, x0 (NOP)
       //  .. .. .. ..       ldr x16, pc+<on-stack replacement address>
       //  .. .. .. ..       blr x16
       patcher.nop(Assembler::INTERRUPT_CODE_NOP);
       break;
   }
 
   // Replace the call address.
   Instruction* load = Instruction::Cast(pc)->preceding(2);
   Address interrupt_address_pointer =
       reinterpret_cast<Address>(load) + load->ImmPCOffset();
   DCHECK((Memory::uint64_at(interrupt_address_pointer) ==
           reinterpret_cast<uint64_t>(
               isolate->builtins()->OnStackReplacement()->entry())) ||
          (Memory::uint64_at(interrupt_address_pointer) ==
           reinterpret_cast<uint64_t>(
               isolate->builtins()->InterruptCheck()->entry())) ||
          (Memory::uint64_at(interrupt_address_pointer) ==
           reinterpret_cast<uint64_t>(
-              isolate->builtins()->OsrAfterStackCheck()->entry())) ||
-         (Memory::uint64_at(interrupt_address_pointer) ==
-          reinterpret_cast<uint64_t>(
               isolate->builtins()->OnStackReplacement()->entry())));
   Memory::uint64_at(interrupt_address_pointer) =
       reinterpret_cast<uint64_t>(replacement_code->entry());
 
   unoptimized_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
       unoptimized_code, reinterpret_cast<Address>(load), replacement_code);
 }
 
 
 BackEdgeTable::BackEdgeState BackEdgeTable::GetBackEdgeState(
     Isolate* isolate,
     Code* unoptimized_code,
     Address pc) {
   // TODO(jbramley): There should be some extra assertions here (as in the ARM
   // back-end), but this function is gone in bleeding_edge so it might not
   // matter anyway.
   Instruction* jump_or_nop = Instruction::Cast(pc)->preceding(3);
 
   if (jump_or_nop->IsNop(Assembler::INTERRUPT_CODE_NOP)) {
     Instruction* load = Instruction::Cast(pc)->preceding(2);
     uint64_t entry = Memory::uint64_at(reinterpret_cast<Address>(load) +
                                        load->ImmPCOffset());
     if (entry == reinterpret_cast<uint64_t>(
         isolate->builtins()->OnStackReplacement()->entry())) {
       return ON_STACK_REPLACEMENT;
-    } else if (entry == reinterpret_cast<uint64_t>(
-        isolate->builtins()->OsrAfterStackCheck()->entry())) {
-      return OSR_AFTER_STACK_CHECK;
     } else {
       UNREACHABLE();
     }
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64