AArch64: Implement support for the shadowcallstack attribute.

AArch64: Implement support for the shadowcallstack attribute.

The implementation of shadow call stack on aarch64 is quite different to
the implementation on x86_64. Instead of reserving a segment register for
the shadow call stack, we reserve the platform register, x18. Any function
that spills lr to sp also spills it to the shadow call stack, a pointer to
which is stored in x18.

Differential Revision: https://reviews.llvm.org/D45239

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@329236 91177308-0d34-0410-b5e6-96231b3b80d8