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

Test: m test-art-host
Change-Id: I6313158e59592d8d132154523be9c82dda3c7eb8
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index c39aed2..11a0d35 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -1734,11 +1734,11 @@
 // A HEnvironment object contains the values of virtual registers at a given location.
 class HEnvironment : public ArenaObject<kArenaAllocEnvironment> {
  public:
-  HEnvironment(ArenaAllocator* arena,
-               size_t number_of_vregs,
-               ArtMethod* method,
-               uint32_t dex_pc,
-               HInstruction* holder)
+  ALWAYS_INLINE HEnvironment(ArenaAllocator* arena,
+                             size_t number_of_vregs,
+                             ArtMethod* method,
+                             uint32_t dex_pc,
+                             HInstruction* holder)
      : vregs_(number_of_vregs, arena->Adapter(kArenaAllocEnvironmentVRegs)),
        locations_(number_of_vregs, arena->Adapter(kArenaAllocEnvironmentLocations)),
        parent_(nullptr),
@@ -1747,7 +1747,7 @@
        holder_(holder) {
   }
 
-  HEnvironment(ArenaAllocator* arena, const HEnvironment& to_copy, HInstruction* holder)
+  ALWAYS_INLINE HEnvironment(ArenaAllocator* arena, const HEnvironment& to_copy, HInstruction* holder)
       : HEnvironment(arena,
                      to_copy.Size(),
                      to_copy.GetMethod(),