Improve instruction creating/adding shorthand in HGraphBuilder

Add multi-argument templates for New, NewUncasted, Add and AddUncasted that
call boilerplate HInstruction::New methods rather than the constructor directly.
This allows for automatic passing of the zone and context for instructions that
need them.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/21356002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15990 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-bce.cc

@@ -260,12 +260,12 @@ class BoundsCheckBbData: public ZoneObject {
     HValue* index_context = IndexContext(*add, check);
     if (index_context == NULL) return false;
 
-    HConstant* new_constant = new(BasicBlock()->zone()) HConstant(
-        new_offset, representation);
+    Zone* zone = BasicBlock()->zone();
+    HConstant* new_constant = HConstant::New(
+        zone, index_context, new_offset);
     if (*add == NULL) {
       new_constant->InsertBefore(check);
-      (*add) = HAdd::New(
-          BasicBlock()->zone(), index_context, original_value, new_constant);
+      (*add) = HAdd::New(zone, index_context, original_value, new_constant);
       (*add)->AssumeRepresentation(representation);
       (*add)->InsertBefore(check);
     } else {

src/hydrogen-bch.cc

@@ -278,10 +278,12 @@ class InductionVariableBlocksTable BASE_EMBEDDED {
     }
 
     // Choose the appropriate limit.
+    Zone* zone = graph()->zone();
+    HValue* context = graph()->GetInvalidContext();
     HValue* limit = data->limit();
     if (has_upper_constant_limit) {
-      HConstant* new_limit = new(pre_header->graph()->zone()) HConstant(
-          upper_constant_limit, length->representation());
+      HConstant* new_limit = HConstant::New(zone, context,
+                                            upper_constant_limit);
       new_limit->InsertBefore(pre_header->end());
       limit = new_limit;
     }
@@ -290,15 +292,15 @@ class InductionVariableBlocksTable BASE_EMBEDDED {
     if (limit->IsInteger32Constant() &&
         limit->block() != pre_header &&
         !limit->block()->Dominates(pre_header)) {
-      HConstant* new_limit = new(pre_header->graph()->zone()) HConstant(
-          limit->GetInteger32Constant(), length->representation());
+      HConstant* new_limit = HConstant::New(zone, context,
+                                            limit->GetInteger32Constant());
       new_limit->InsertBefore(pre_header->end());
       limit = new_limit;
     }
 
     // Do the hoisting.
-    HBoundsCheck* hoisted_check = new(pre_header->zone()) HBoundsCheck(
-        limit, check->check()->length());
+    HBoundsCheck* hoisted_check = HBoundsCheck::New(
+        zone, context, limit, check->check()->length());
     hoisted_check->InsertBefore(pre_header->end());
     hoisted_check->set_allow_equality(true);
     hoisted_check->block()->graph()->isolate()->counters()->