Comment 32 for bug 1638695

I don't feel like the change from fstack-protector-strong
to fstack-protector should be made. The performance testing results in
the spreadsheet don't suggest that the change positively impacts
performance in a meaningful way. fstack-protector-strong slightly
outperforms fstack-protector in some situations and slightly under
performs in others, suggesting that the difference is within the noise
threshold. I'd strongly prefer that we continue to use
fstack-protector-strong.