Store OptTable::Info::Name as a StringRef
This is a recommit of
8ae18303f97d5dcfaecc90b4d87effb2011ed82e,
with a few cleanups.
This avoids implicit conversion to StringRef at several points, which in
turns avoid redundant calls to strlen.
As a side effect, this greatly simplifies the implementation of
StrCmpOptionNameIgnoreCase.
It also eventually gives a consistent, humble speedup in compilation
time (timing updated since original commit).
https://llvm-compile-time-tracker.com/compare.php?from=
de4b6a1bc64db33643f001ad45fae7b92b4a4688&to=
c23a93d1292052b4be2fbe8c586fa31143d0c7ed&stat=instructions:u
Differential Revision: https://reviews.llvm.org/D139274