[profile][test] Add -fuse-ld=bfd to make instrprof-lto-pgogen.c robust

[profile][test] Add -fuse-ld=bfd to make instrprof-lto-pgogen.c robust

Otherwise if 'ld' is an older system LLD (FreeBSD; or if someone adds 'ld' to
point to an LLD from a different installation) which does not support the
current ModuleSummaryIndex::BitCodeSummaryVersion, the test will fail.

Add lit feature 'binutils_lto'. GNU ld is more common than GNU gold, so
we can just require 'is_binutils_lto_supported' to additionally support GNU ld.

Reviewed By: myhsu

Differential Revision: https://reviews.llvm.org/D84133