[turbofan] Add backend support for load/store float32 values.

src/compiler/simplified-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/simplified-lowering.h"
 
 #include <deque>
 #include <queue>
 
 #include "src/compiler/common-operator.h"
@@ skipping 36 matching lines @@
   //     representation changes between uses that demand a particular
   //     representation and nodes that produce a different representation.
   LOWER
 };
 
 
 class RepresentationSelector {
  public:
   // Information for each node tracked during the fixpoint.
   struct NodeInfo {
-    MachineTypeUnion use : 14;     // Union of all usages for the node.
+    MachineTypeUnion use : 15;     // Union of all usages for the node.
     bool queued : 1;           // Bookkeeping for the traversal.
     bool visited : 1;          // Bookkeeping for the traversal.
-    MachineTypeUnion output : 14;  // Output type of the node.
+    MachineTypeUnion output : 15;  // Output type of the node.
   };
 
   RepresentationSelector(JSGraph* jsgraph, Zone* zone,
                          RepresentationChanger* changer)
       : jsgraph_(jsgraph),
         count_(jsgraph->graph()->NodeCount()),
         info_(zone->NewArray<NodeInfo>(count_)),
         nodes_(NodeVector::allocator_type(zone)),
         replacements_(NodeVector::allocator_type(zone)),
         contains_js_nodes_(false),
@@ skipping 929 matching lines @@
       break;
     default:
       UNREACHABLE();
       break;
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8