Inlining a few small methods based on profiling dex2oat with perf.

Test: m test-art-host
Change-Id: I6313158e59592d8d132154523be9c82dda3c7eb8
diff --git a/runtime/stack_map.h b/runtime/stack_map.h
index 67f0b57..d936ce9 100644
--- a/runtime/stack_map.h
+++ b/runtime/stack_map.h
@@ -571,7 +571,7 @@
     }
   }
 
-  bool IsDexRegisterLive(uint16_t dex_register_number) const {
+  ALWAYS_INLINE bool IsDexRegisterLive(uint16_t dex_register_number) const {
     size_t live_bit_mask_offset_in_bits = GetLiveBitMaskOffset() * kBitsPerByte;
     return region_.LoadBit(live_bit_mask_offset_in_bits + dex_register_number);
   }