[compiler] Make SFI "optimize" flag a "tier up" flag

src/builtins/ppc/builtins-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1485 matching lines @@
   __ CmpSmiLiteral(index, Smi::FromInt(1), r0);
   __ bgt(&loop_top);
 
   // We found neither literals nor code.
   __ b(&gotta_call_runtime);
 
   __ bind(&try_shared);
   __ LoadP(entry,
            FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   // Is the shared function marked for optimization?
-  __ lbz(r8,
-         FieldMemOperand(
-             entry, SharedFunctionInfo::kWasMarkedForOptimizationByteOffset));
-  __ TestBit(r8, SharedFunctionInfo::kWasMarkedForOptimizationBitWithinByte,
-             r0);
+  __ lbz(r8, FieldMemOperand(
+                 entry, SharedFunctionInfo::kWasMarkedForTierUpByteOffset));
+  __ TestBit(r8, SharedFunctionInfo::kWasMarkedForTierUpBitWithinByte, r0);
   __ beq(&gotta_call_runtime);
   // Is the full code valid?
   __ LoadP(entry, FieldMemOperand(entry, SharedFunctionInfo::kCodeOffset));
   __ lwz(r8, FieldMemOperand(entry, Code::kFlagsOffset));
   __ DecodeField<Code::KindField>(r8);
   __ cmpi(r8, Operand(Code::BUILTIN));
   __ beq(&gotta_call_runtime);
   // Yes, install the full code.
   __ addi(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ StoreP(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset), r0);
@@ skipping 1482 matching lines @@
     __ CallRuntime(Runtime::kThrowStackOverflow);
     __ bkpt(0);
   }
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC