Reland "[turbofan] Discard the shared code entry in the optimized code map."

src/builtins/mips/builtins-mips.cc

Index: src/builtins/mips/builtins-mips.cc
diff --git a/src/builtins/mips/builtins-mips.cc b/src/builtins/mips/builtins-mips.cc
index e0ba0810e14b5f38a93e449926367b45a87d9b02..c470c547d6b920ece32093fb868ea5ae66e31d34 100644
--- a/src/builtins/mips/builtins-mips.cc
+++ b/src/builtins/mips/builtins-mips.cc
@@ -1371,7 +1371,6 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   // -----------------------------------
   // First lookup code, maybe we don't need to compile!
   Label gotta_call_runtime, gotta_call_runtime_no_stack;
-  Label maybe_call_runtime;
   Label try_shared;
   Label loop_top, loop_bottom;
 
@@ -1435,15 +1434,12 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
         FieldMemOperand(array_pointer,
                         SharedFunctionInfo::kOffsetToPreviousCachedCode));
   __ lw(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
-  __ JumpIfSmi(entry, &maybe_call_runtime);
+  __ JumpIfSmi(entry, &try_shared);
 
   // Found literals and code. Get them into the closure and return.
   __ pop(closure);
   // Store code entry in the closure.
   __ Addu(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-
-  Label install_optimized_code_and_tailcall;
-  __ bind(&install_optimized_code_and_tailcall);
   __ sw(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset));
   __ RecordWriteCodeEntryField(closure, entry, t1);
 
@@ -1478,20 +1474,8 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   // We found neither literals nor code.
   __ jmp(&gotta_call_runtime);
 
-  __ bind(&maybe_call_runtime);
-  __ pop(closure);
-
-  // Last possibility. Check the context free optimized code map entry.
-  __ lw(entry, FieldMemOperand(map, FixedArray::kHeaderSize +
-                                        SharedFunctionInfo::kSharedCodeIndex));
-  __ lw(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
-  __ JumpIfSmi(entry, &try_shared);
-
-  // Store code entry in the closure.
-  __ Addu(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ jmp(&install_optimized_code_and_tailcall);
-
   __ bind(&try_shared);
+  __ pop(closure);
   __ pop(new_target);
   __ pop(argument_count);
   // Is the full code valid?