Rename DwarfAcceleratorTable to AppleAcceleratorTable. NFC

This frees up the first name to be used as an base class for the
apple table and the dwarf5 .debug_names accel table. The rename  was
split off from D42297 (adding of debug_names support), which is still
under review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323113 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed