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

src/builtins/ppc/builtins-ppc.cc

Index: src/builtins/ppc/builtins-ppc.cc
diff --git a/src/builtins/ppc/builtins-ppc.cc b/src/builtins/ppc/builtins-ppc.cc
index 6e6ce4341e2587d1876bbceba8201650d9f47dc6..a54eee942d112f3a9fdf767d57a8e0c135ab7d81 100644
--- a/src/builtins/ppc/builtins-ppc.cc
+++ b/src/builtins/ppc/builtins-ppc.cc
@@ -1502,12 +1502,10 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   __ 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);
+  // Is the shared function marked for tier up?
+  __ lbz(r8, FieldMemOperand(entry,
+                             SharedFunctionInfo::kMarkedForTierUpByteOffset));
+  __ TestBit(r8, SharedFunctionInfo::kMarkedForTierUpBitWithinByte, r0);
   __ beq(&gotta_call_runtime);
   // Is the full code valid?
   __ LoadP(entry, FieldMemOperand(entry, SharedFunctionInfo::kCodeOffset));