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

src/full-codegen/s390/full-codegen-s390.cc

Index: src/full-codegen/s390/full-codegen-s390.cc
diff --git a/src/full-codegen/s390/full-codegen-s390.cc b/src/full-codegen/s390/full-codegen-s390.cc
index b711ce51f4f8def51bec5d13fae08e980819bd0f..1b17d2c6b3f30529819642ed22ed9ce374a6bcd5 100644
--- a/src/full-codegen/s390/full-codegen-s390.cc
+++ b/src/full-codegen/s390/full-codegen-s390.cc
@@ -1194,7 +1194,7 @@ 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(),
@@ -2962,7 +2962,7 @@ 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(r4);
           __ mov(r3, Operand(var->name()));
           __ Push(r4, r3);