[deoptimizer] Remove dead Code::LookupRangeInHandlerTable.

This removes the supporting function to perform a range-lookup in the
exception handler table for unoptimized code. Such tables are by now
guaranteed to be empty, the deoptimizer cannot encounter this case.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2529343003
Cr-Commit-Position: refs/heads/master@{#41318}

src/deoptimizer.cc

@@ -627,28 +627,23 @@ namespace {
 int LookupCatchHandler(TranslatedFrame* translated_frame, int* data_out) {
   switch (translated_frame->kind()) {
     case TranslatedFrame::kFunction: {
-      BailoutId node_id = translated_frame->node_id();
+#ifdef DEBUG
       JSFunction* function =
           JSFunction::cast(translated_frame->begin()->GetRawValue());
       Code* non_optimized_code = function->shared()->code();
-      FixedArray* raw_data = non_optimized_code->deoptimization_data();
-      DeoptimizationOutputData* data = DeoptimizationOutputData::cast(raw_data);
-      unsigned pc_and_state =
-          Deoptimizer::GetOutputInfo(data, node_id, function->shared());
-      unsigned pc_offset = FullCodeGenerator::PcField::decode(pc_and_state);
       HandlerTable* table =
           HandlerTable::cast(non_optimized_code->handler_table());
-      HandlerTable::CatchPrediction prediction;
-      return table->LookupRange(pc_offset, data_out, &prediction);
+      DCHECK_EQ(0, table->NumberOfRangeEntries());
+#endif
+      break;
     }
     case TranslatedFrame::kInterpretedFunction: {
       int bytecode_offset = translated_frame->node_id().ToInt();
       JSFunction* function =
           JSFunction::cast(translated_frame->begin()->GetRawValue());
       BytecodeArray* bytecode = function->shared()->bytecode_array();
-      HandlerTable::CatchPrediction prediction;
       return bytecode->LookupRangeInHandlerTable(bytecode_offset, data_out,
-                                                 &prediction);
+                                                 nullptr);
     }
     default:
       break;

src/objects.cc

@@ -14402,13 +14402,6 @@ uint32_t Code::TranslateAstIdToPcOffset(BailoutId ast_id) {
   return 0;
 }
 
-int Code::LookupRangeInHandlerTable(int code_offset, int* data,
-                                    HandlerTable::CatchPrediction* prediction) {
-  DCHECK(!is_optimized_code());
-  HandlerTable* table = HandlerTable::cast(handler_table());
-  return table->LookupRange(code_offset, data, prediction);
-}
-
 void Code::MakeCodeAgeSequenceYoung(byte* sequence, Isolate* isolate) {
   PatchPlatformCodeAge(isolate, sequence, kNoAgeCodeAge, NO_MARKING_PARITY);
 }

src/objects.h

@@ -5713,9 +5713,6 @@ class Code: public HeapObject {
   BailoutId TranslatePcOffsetToAstId(uint32_t pc_offset);
   uint32_t TranslateAstIdToPcOffset(BailoutId ast_id);
 
-  int LookupRangeInHandlerTable(int code_offset, int* data,
-                                HandlerTable::CatchPrediction* prediction);
-
 #define DECLARE_CODE_AGE_ENUM(X) k##X##CodeAge,
   enum Age {
     kToBeExecutedOnceCodeAge = -3,