[Bug bootstrap/63784] [5 Regression] profiledbootstrap failure with bootstrap-lto

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63784

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
We have a few choices:

1. Build libcc1 with LTO when GCC is configured with
"--with-build-config=bootstrap-lto".  Or
2. Teach libtool to always add -fPIC when linking shared
object to support static archive compiled with LTO.  Or 
3. Don't compile libiberty with LTO.

I tbink #2 is a better choice since the same thing may happen elsewhere.