Improve documentation of memory layouts in stack_map.h.

Also shorten NumberOfDexRegisterLocationCatalogEntries to
NumberOfLocationCatalogEntries.

Change-Id: I55f8ec2960ea67e2eb6871a417bd442d0e2810fb
diff --git a/compiler/optimizing/stack_map_stream.cc b/compiler/optimizing/stack_map_stream.cc
index 65610d5..1f1530f 100644
--- a/compiler/optimizing/stack_map_stream.cc
+++ b/compiler/optimizing/stack_map_stream.cc
@@ -248,7 +248,7 @@
   DCHECK_EQ(code_info.GetStackMapsSize(code_info.ExtractEncoding()), stack_maps_size_);
 
   // Set the Dex register location catalog.
-  code_info.SetNumberOfDexRegisterLocationCatalogEntries(location_catalog_entries_.Size());
+  code_info.SetNumberOfLocationCatalogEntries(location_catalog_entries_.Size());
   MemoryRegion dex_register_location_catalog_region = region.Subregion(
       dex_register_location_catalog_start_, dex_register_location_catalog_size_);
   DexRegisterLocationCatalog dex_register_location_catalog(dex_register_location_catalog_region);