implement support for __builtin_eh_return_data_regno on x86-32 and x86-64.
This implements PR5034 and rdar://6836445.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82614 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed