driver: pass '-fPIC' option to assembler as well
Before the patch '-fPIC' was passed only to C compiler,
but not to assembler itself.
It led to runtime crash in GHC_DYNAMIC_PROGRAMS=YES mode
Technical details are in 'Note [-fPIC for assembler]'.
Signed-off-by: Sergei Trofimovich <firstname.lastname@example.org>
Test Plan: validate on sparc
Reviewers: simonmar, austin, kgardas
Reviewed By: austin
Subscribers: simonmar, ezyang, carter
Differential Revision: https://phabricator.haskell.org/D177