[llvm] r235988 - Use CIE version 4 for dwarf4.

[Anton Korobeynikov]

> As Paul said, this break the processing of the frame information when the
> CIE header has a version number of 4 due to the missing header fields.
Yeah, I'm seeing objdump crashes on the objects generated with -g and
gdb issues warnings and refuses to debug.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University