Use ashmem to name our various anonymous regions.

Change-Id: If64576b831a2fdcb83ffce40e6ec8ece8d902672
diff --git a/src/mark_stack.cc b/src/mark_stack.cc
index 4a9502b..34bad7d 100644
--- a/src/mark_stack.cc
+++ b/src/mark_stack.cc
@@ -22,7 +22,7 @@
 
 bool MarkStack::Init() {
   size_t length = 64 * MB;
-  mem_map_.reset(MemMap::Map(length, PROT_READ | PROT_WRITE));
+  mem_map_.reset(MemMap::Map("dalvik-mark-stack", NULL, length, PROT_READ | PROT_WRITE));
   if (mem_map_.get() == NULL) {
     return false;
   }