[builtins] CompileLazy bailed out to the runtime entirely too often.

src/builtins/x64/builtins-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 986 matching lines @@
 
   // Do we have a valid feedback vector?
   __ movp(rbx, FieldOperand(closure, JSFunction::kLiteralsOffset));
   __ movp(rbx, FieldOperand(rbx, LiteralsArray::kFeedbackVectorOffset));
   __ JumpIfRoot(rbx, Heap::kUndefinedValueRootIndex, &gotta_call_runtime);
 
   __ movp(map, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   __ movp(map, FieldOperand(map, SharedFunctionInfo::kOptimizedCodeMapOffset));
   __ SmiToInteger32(index, FieldOperand(map, FixedArray::kLengthOffset));
   __ cmpl(index, Immediate(2));
-  __ j(less, &gotta_call_runtime);
+  __ j(less, &try_shared);
 
   // r14 : native context
   // r9  : length / index
   // r8  : optimized code map
   // rdx : new target
   // rdi : closure
   Register native_context = r14;
   __ movp(native_context, NativeContextOperand());
 
   __ bind(&loop_top);
@@ skipping 36 matching lines @@
   __ RecordWriteContextSlot(native_context, function_list_offset, closure, r15,
                             kDontSaveFPRegs);
   __ movp(closure, rbx);
   __ jmp(entry);
 
   __ bind(&loop_bottom);
   __ subl(index, Immediate(SharedFunctionInfo::kEntryLength));
   __ cmpl(index, Immediate(1));
   __ j(greater, &loop_top);
 
-  // We found no code.
-  __ jmp(&gotta_call_runtime);
-
+  // We found no code. Try the SharedFunctionInfo.
   __ bind(&try_shared);
   __ movp(entry, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   // Is the shared function marked for tier up?
   __ testb(FieldOperand(entry, SharedFunctionInfo::kMarkedForTierUpByteOffset),
            Immediate(1 << SharedFunctionInfo::kMarkedForTierUpBitWithinByte));
   __ j(not_zero, &gotta_call_runtime);
 
   // If SFI points to anything other than CompileLazy, install that.
   __ movp(entry, FieldOperand(entry, SharedFunctionInfo::kCodeOffset));
   __ Move(rbx, masm->CodeObject());
@@ skipping 1963 matching lines @@
 void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
   Generate_OnStackReplacementHelper(masm, true);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64