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/compiler/exception_test.cc b/compiler/exception_test.cc
index e223534..86f91c5 100644
--- a/compiler/exception_test.cc
+++ b/compiler/exception_test.cc
@@ -170,7 +170,7 @@
   Runtime* r = Runtime::Current();
   r->SetInstructionSet(kRuntimeISA);
   ArtMethod* save_method = r->CreateCalleeSaveMethod();
-  r->SetCalleeSaveMethod(save_method, Runtime::kSaveAll);
+  r->SetCalleeSaveMethod(save_method, Runtime::kSaveAllCalleeSaves);
   QuickMethodFrameInfo frame_info = r->GetRuntimeMethodFrameInfo(save_method);
 
   ASSERT_EQ(kStackAlignment, 16U);
diff --git a/compiler/image_writer.cc b/compiler/image_writer.cc
index 7c87a60..efae4d0 100644
--- a/compiler/image_writer.cc
+++ b/compiler/image_writer.cc
@@ -1373,11 +1373,12 @@
   image_methods_[ImageHeader::kResolutionMethod] = runtime->GetResolutionMethod();
   image_methods_[ImageHeader::kImtConflictMethod] = runtime->GetImtConflictMethod();
   image_methods_[ImageHeader::kImtUnimplementedMethod] = runtime->GetImtUnimplementedMethod();
-  image_methods_[ImageHeader::kCalleeSaveMethod] = runtime->GetCalleeSaveMethod(Runtime::kSaveAll);
-  image_methods_[ImageHeader::kRefsOnlySaveMethod] =
-      runtime->GetCalleeSaveMethod(Runtime::kRefsOnly);
-  image_methods_[ImageHeader::kRefsAndArgsSaveMethod] =
-      runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs);
+  image_methods_[ImageHeader::kSaveAllCalleeSavesMethod] =
+      runtime->GetCalleeSaveMethod(Runtime::kSaveAllCalleeSaves);
+  image_methods_[ImageHeader::kSaveRefsOnlyMethod] =
+      runtime->GetCalleeSaveMethod(Runtime::kSaveRefsOnly);
+  image_methods_[ImageHeader::kSaveRefsAndArgsMethod] =
+      runtime->GetCalleeSaveMethod(Runtime::kSaveRefsAndArgs);
   image_methods_[ImageHeader::kSaveEverythingMethod] =
       runtime->GetCalleeSaveMethod(Runtime::kSaveEverything);
   // Visit image methods first to have the main runtime methods in the first image.