AArch64: address some outstanding TODOs.

Fix comments in arm64_lir.h. Rename Arm* to A64* and replace FWIDE,
FUNWIDE, ... with WIDE, UNWIDE, ...

Change-Id: I4900902e28463ea5e00e34ea40ddfc15704c0bfa
diff --git a/compiler/dex/quick/arm64/codegen_arm64.h b/compiler/dex/quick/arm64/codegen_arm64.h
index 1c40292..55cc938 100644
--- a/compiler/dex/quick/arm64/codegen_arm64.h
+++ b/compiler/dex/quick/arm64/codegen_arm64.h
@@ -395,7 +395,7 @@
                      RegLocation rl_src2, bool is_div);
 
   InToRegStorageMapping in_to_reg_storage_mapping_;
-  static const ArmEncodingMap EncodingMap[kA64Last];
+  static const A64EncodingMap EncodingMap[kA64Last];
 };
 
 }  // namespace art