[PATCH] AArch64 : Implement GHC calling convention.

[Renato Golin]

================
Comment at: test/CodeGen/AArch64/ghc-cc.ll:37
@@ +36,3 @@
+entry:
+  ; CHECK-NOT:   mov   {{x[0-9]+}}, sp
+  ; CHECK:       bl    addtwo
----------------
Would be good to have a CHECK-LABEL here, too.

http://reviews.llvm.org/D6877

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