ARM, AArch64, X86: Check preserved registers for tail calls.
We can only perform a tail call to a callee that preserves all the
registers that the caller needs to preserve.
This situation happens with calling conventions like preserver_mostcc or
cxx_fast_tls. It was explicitely handled for fast_tls and failing for
preserve_most. This patch generalizes the check to any calling
convention.
Related to rdar://
24207743
Differential Revision: http://reviews.llvm.org/D18680
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265329
91177308-0d34-0410-b5e6-
96231b3b80d8