[PATCH AutoFDO]Call update_max_bb_count even if autofdo counts are all zeros

[bin.cheng]

Hi,
This patch calls update_max_bb_count even if autofdo counts are all zeros,
otherwise it would trigger ICE because of mismatch between basic blocks'
count (all autofdo::zero) and cfun->cfg->max_count (guessed::non_zero).
For functions with all autofdo::zero counts, we should improve by restoring
guessed profile counts, but this maybe not for GCC-9.

Bootstrap and test on x86_64 along with following patches.  Is it OK?

Thanks,
bin

2018-12-13  Bin Cheng  <bin.ch...@linux.alibaba.com>

        * auto-profile.c (afdo_annotate_cfg): Call update_max_bb_count even
        if autofdo counts are all zeros.

0005-Call-update_max_bb_count-even-if-autufdo-counts-are-.patch
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