Eliminate iOS-specific tail call instructions.

After register masks were introdruced to represent the call clobbers, it
is no longer necessary to have duplicate instruction for iOS.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154209 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed