ART: Introduce stackmap with no DexRegInfo.

Some of safepoints don't need to have DexRegisterMap info;
this will decrease the stackmap size.

.oat file size reduction:
 - boot.oat:           -233 kb (-5.4%)
 - boot-framework.oat: -704 kb (-4.9%)

Test: 461-get-reference-vreg, 466-get-live-vreg.
Test: 543-env-long-ref, 616-cha*.
Test: test-art-target, +gc-stress.

Change-Id: Idbad355770e30a30dcf14127642e03ee666878b8
diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index 33c624a..f45e3d7 100644
--- a/compiler/optimizing/stack_map_stream.h
+++ b/compiler/optimizing/stack_map_stream.h
@@ -68,7 +68,8 @@
                           uint32_t native_pc_offset,
                           uint32_t register_mask = 0,
                           BitVector* sp_mask = nullptr,
-                          StackMap::Kind kind = StackMap::Kind::Default);
+                          StackMap::Kind kind = StackMap::Kind::Default,
+                          bool needs_vreg_info = true);
   void EndStackMapEntry();
 
   void AddDexRegisterEntry(DexRegisterLocation::Kind kind, int32_t value) {