ARM: Use ubfx and movw instructions to avoid a PC-relative load on

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 10578)
+++ src/objects.cc	(working copy)
@@ -8028,6 +8028,18 @@
   VisitPointer(rinfo->target_object_address());
 }
 
+
+#ifdef V8_TARGET_ARCH_ARM
+void ObjectVisitor::VisitEmbeddedMapSignature(RelocInfo* rinfo) {
+  ASSERT(rinfo->rmode() == RelocInfo::MAP_SIGNATURE);
+  Object* object = rinfo->target_object();
+  Object* copy = object;
+  VisitPointer(&copy);
+  ASSERT(copy == object);
+}
+#endif
+
+
 void ObjectVisitor::VisitExternalReference(RelocInfo* rinfo) {
   Address* p = rinfo->target_reference_address();
   VisitExternalReferences(p, p + 1);
@@ -8160,6 +8172,9 @@
   ASSERT(is_inline_cache_stub());
   AssertNoAllocation no_allocation;
   int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
+#ifdef V8_TARGET_ARCH_ARM
+  mask |= RelocInfo::ModeMask(RelocInfo::MAP_SIGNATURE);
+#endif
   for (RelocIterator it(this, mask); !it.done(); it.next()) {
     RelocInfo* info = it.rinfo();
     Object* object = info->target_object();