Rename callee save enumerators.

And related image method enumerators, macros, etc.
Clean up some entrypoint assembly comments.

This is a follow-up to
    https://android-review.googlesource.com/252348

Test: Run ART test suite on host and Nexus 9.
Bug: 30212852
Change-Id: I2707342d4255c88c547655be83ed97a67e12ae9e
diff --git a/runtime/art_method-inl.h b/runtime/art_method-inl.h
index 2421246..1659f33 100644
--- a/runtime/art_method-inl.h
+++ b/runtime/art_method-inl.h
@@ -322,11 +322,11 @@
     return "<runtime internal resolution method>";
   } else if (this == runtime->GetImtConflictMethod()) {
     return "<runtime internal imt conflict method>";
-  } else if (this == runtime->GetCalleeSaveMethod(Runtime::kSaveAll)) {
+  } else if (this == runtime->GetCalleeSaveMethod(Runtime::kSaveAllCalleeSaves)) {
     return "<runtime internal callee-save all registers method>";
-  } else if (this == runtime->GetCalleeSaveMethod(Runtime::kRefsOnly)) {
+  } else if (this == runtime->GetCalleeSaveMethod(Runtime::kSaveRefsOnly)) {
     return "<runtime internal callee-save reference registers method>";
-  } else if (this == runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs)) {
+  } else if (this == runtime->GetCalleeSaveMethod(Runtime::kSaveRefsAndArgs)) {
     return "<runtime internal callee-save reference and argument registers method>";
   } else {
     return "<unknown runtime internal method>";