[BOLT] Check no-LBR samples in mayHaveProfileData

No-LBR mode wasn't tested and slipped when mayHaveProfileData was added for
Lite mode. This enables processing of profiles collected without LBR and
converted with `perf2bolt -nl` option.

Test Plan:
bin/llvm-lit -a tools/bolt/test/X86/nolbr.s
https://github.com/rafaelauler/bolt-tests/pull/20

Reviewed By: #bolt, rafauler

Differential Revision: https://reviews.llvm.org/D140256