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Add two new ways of accessing the unsafe stack pointer: * At a fixed offset from the thread TLS base. This is very similar to StackProtector cookies, but we plan to extend it to other backends (ARM in particular) soon. Bionic-side implementation here: https://android-review.googlesource.com/170988. * Via a function call, as a fallback for platforms that provide neither a fixed TLS slot, nor a reasonable TLS implementation (i.e. not emutls). This is a re-commit of a change in r248357 that was reverted in r248358. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248405 91177308-0d34-0410-b5e6-96231b3b80d8
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