A64: Implement LOsrEntry and LUnknownOSRValue

src/a64/lithium-a64.cc

Index: src/a64/lithium-a64.cc
diff --git a/src/a64/lithium-a64.cc b/src/a64/lithium-a64.cc
index dbcb4e118f85c11c54109340755f8cf7f9f34c72..bdb9033874e84444403668ac3daeb9fe20f9a411 100644
--- a/src/a64/lithium-a64.cc
+++ b/src/a64/lithium-a64.cc
@@ -1882,7 +1882,10 @@ LInstruction* LChunkBuilder::DoNumericConstraint(HNumericConstraint* instr) {
 
 
 LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
+  ASSERT(argument_count_ == 0);
+  allocator_->MarkAsOsrEntry();
+  current_block_->last_environment()->set_ast_id(instr->ast_id());
+  return AssignEnvironment(new(zone()) LOsrEntry);
 }
 
 
@@ -2461,7 +2464,12 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
 
 
 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
+  int spill_index = chunk_->GetNextSpillIndex();
+  if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
+    Abort("Too many spill slots needed for OSR");
+    spill_index = 0;
+  }
+  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
 }