[aarch64-port-dev ] RFR (S) 8228770: Revert development hsdis changes

[Aleksey Shipilev]

RFE:
  https://bugs.openjdk.java.net/browse/JDK-8228770

Current 8u aarch64-port has changes in hsdis code/config:

https://builds.shipilev.net/patch-openjdk-jdk8-aarch64/hotspot/src/share/tools/hsdis/Makefile.sdiff.html

https://builds.shipilev.net/patch-openjdk-jdk8-aarch64/hotspot/src/share/tools/hsdis/hsdis.c.sdiff.html

I believe these are not needed anymore. We just want to bring the change from staging repo:
  http://hg.openjdk.java.net/aarch64-port/stage/hotspot/rev/ef43f5719e95

Full patch:
  http://cr.openjdk.java.net/~shade/8228770/webrev.01/

This would leaves us with this change against 8u upstream:

$ hg diff -r f6fa131b5f40 src/share/tools/
diff -r f6fa131b5f40 src/share/tools/hsdis/hsdis.c
--- a/src/share/tools/hsdis/hsdis.c     Thu Jul 11 00:03:29 2019 +0100
+++ b/src/share/tools/hsdis/hsdis.c     Tue Jul 30 13:02:43 2019 +0200
@@ -489,10 +489,13 @@
   res = "sparc:v9b";
 #endif
 #if defined(LIBARCH_ppc64) || defined(LIBARCH_ppc64le)
   res = "powerpc:common64";
 #endif
+#ifdef LIBARCH_aarch64
+  res = "aarch64";
+#endif
   if (res == NULL)
     res = "architecture not set in Makefile!";
   return res;
 }

While most hsdis builds would be with jdk/jdk code, that contains most up-to-date hsdis source, I
still tried to build it from the 8u aarch64-port tree after this change. It works fine on RHEL with
binutils 2.32, tested with JMH perfasm and newly built hsdis binary.

Testing: building hsdis on aarch64, x86_64; adhoc hsdis tests; eyeballing diff against upstream

-- 
Thanks,
-Aleksey