Revert of Revert [TypeFeedbackVector] Root literal arrays in function literal slots

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 a121ebd409378fc8deb0fc0e3b2855650b93273b..6e9754755e41cc0a5ef5c1e45b6c90ff63050804 100644
--- a/src/builtins/ppc/builtins-ppc.cc
+++ b/src/builtins/ppc/builtins-ppc.cc
@@ -1363,6 +1363,12 @@
   Register closure = r4;
   Register map = r9;
   Register index = r5;
+
+  // Do we have a valid feedback vector?
+  __ LoadP(index, FieldMemOperand(closure, JSFunction::kLiteralsOffset));
+  __ LoadP(index, FieldMemOperand(index, LiteralsArray::kFeedbackVectorOffset));
+  __ JumpIfRoot(index, Heap::kUndefinedValueRootIndex, &gotta_call_runtime);
+
   __ LoadP(map,
            FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   __ LoadP(map,
@@ -1371,7 +1377,6 @@
   __ CmpSmiLiteral(index, Smi::FromInt(2), r0);
   __ blt(&gotta_call_runtime);
 
-  // Find literals.
   // r10 : native context
   // r5  : length / index
   // r9  : optimized code map
@@ -1392,18 +1397,6 @@
   __ LoadP(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
   __ cmp(temp, native_context);
   __ bne(&loop_bottom);
-  // Literals available?
-  __ LoadP(temp,
-           FieldMemOperand(array_pointer,
-                           SharedFunctionInfo::kOffsetToPreviousLiterals));
-  __ LoadP(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
-  __ JumpIfSmi(temp, &gotta_call_runtime);
-
-  // Save the literals in the closure.
-  __ StoreP(temp, FieldMemOperand(closure, JSFunction::kLiteralsOffset), r0);
-  __ RecordWriteField(closure, JSFunction::kLiteralsOffset, temp, r7,
-                      kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
 
   // Code available?
   Register entry = r7;
@@ -1413,7 +1406,7 @@
   __ LoadP(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
   __ JumpIfSmi(entry, &try_shared);
 
-  // Found literals and code. Get them into the closure and return.
+  // Found code. Get it into the closure and return.
   // Store code entry in the closure.
   __ addi(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ StoreP(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset), r0);
@@ -1447,7 +1440,7 @@
   __ CmpSmiLiteral(index, Smi::FromInt(1), r0);
   __ bgt(&loop_top);
 
-  // We found neither literals nor code.
+  // We found no code.
   __ b(&gotta_call_runtime);
 
   __ bind(&try_shared);