fortify: Migrate trivial cases to dynamic check macros

|__builtin_constant_p| has become more flexible in clang. In particular,
it's no longer forcibly lowered before inlining, so we can actually use
it on function parameters (or |__bos(param)|).

This CL tweaks things so that trivially safe calls to FORTIFY'ed
functions compile into direct calls to those functions, rather than to
their _chk counterparts. This will be the most impactful with things
like |memset|, |memcpy|, etc., since clang has way more flexibility
about how to lower those than it does with |__memset_chk|,
|__memcpy_chk|, ...

As noted in the comments, the spelling of the new macros is meant to
match closely with the spelling of our |__bos_static| macros used in
|diagnose_if|.

This isn't a full cleanup of all of the cases in which we can do this.
Just a start on the super simple cases.

Bug: 131861088
Test: m checkbuild; blueline boots.

Change-Id: I696f42ce4a65231e0c4a78a4c5133a6be1cb7708

0 files changed, 0 insertions, 0 deletions