CXX_FAST_TLS calling convention: fix issue on ARM.

When we have a single basic block, the explicit copy-back instructions should
be inserted right before the terminator. Before this fix, they were wrongly
placed at the beginning of the basic block.

PR26136


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257930 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed