[PATCH] AArch64 : Implement GHC calling convention.

[Renato Golin]

Apart from the typo, LGTM. Please, commit with the change.

cheers,
--renato


================
Comment at: test/CodeGen/AArch64/ghc-cc.ll:38
@@ +37,3 @@
+entry:
+  ; CHECK-LABAL: addtwo
+  ; CHECK:       add      x0, x19, x20
----------------
typo :)

http://reviews.llvm.org/D6877

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