switch ubsan to blacklist

We're close enough that it's easier to use "undefined"
to turn on all supported UBSAN sanitizers and then
keep a couple in fyi_sanitizers as a blacklist.

I'm going to try to fix "enum" next too, so hopefully
that won't be in there too long.

I did a little flag cleanup too.  -fno-omit-frame-pointer
was harmlessly in there twice for Android builds.

Change-Id: I8216fb0685423b2ff56db2e2be5bbeb4b48f932f
Reviewed-on: https://skia-review.googlesource.com/146760
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed