Replace CollectVariables with locals(), update callsites to walk locals instead

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 51f5ff896839f15beebb2b6dce81dd516c7e250a..a5ec576026b5bc99d0819e53096ed9b8b52c0786 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -1230,7 +1230,7 @@ void FullCodeGenerator::EmitGlobalVariableLoad(VariableProxy* proxy,
                                                TypeofMode typeof_mode) {
 #ifdef DEBUG
   Variable* var = proxy->var();
-  DCHECK(var->IsUnallocatedOrGlobalSlot() ||
+  DCHECK(var->IsUnallocated() ||
          (var->IsLookupSlot() && var->mode() == DYNAMIC_GLOBAL));
 #endif
   __ mov(LoadGlobalDescriptor::SlotRegister(),
@@ -3041,7 +3041,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
         // "delete this" is allowed.
         bool is_this = var->is_this();
         DCHECK(is_sloppy(language_mode()) || is_this);
-        if (var->IsUnallocatedOrGlobalSlot()) {
+        if (var->IsUnallocated()) {
           __ LoadGlobalObject(r5);
           __ mov(r4, Operand(var->name()));
           __ Push(r5, r4);