AArch64: get GHC Calling convention working

Building on AArch64 via the LLVM abckend has been working for some time. Its now time to get ("Unregisterised", "NO") working as well.

Enabling GHC calling convention can be done with this patch to configure.ac:

diff --git a/configure.ac b/configure.ac
index d5d9ab3..a11e5af 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,7 +241,7 @@ AC_SUBST(SOLARIS_BROKEN_SHLD)
 dnl ** Do an unregisterised build?
 dnl --------------------------------------------------------------
 case "$HostArch" in
-    i386|x86_64|powerpc|arm)
+    i386|x86_64|powerpc|arm|aarch64)
         UnregisterisedDefault=NO
         ;;
     *)

but when building it this way, the stage2 compiler dies will Illegal instructon.

Trac metadata

Trac field	Value
Version	7.11
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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