Add a notice for gdb debugging in component builds

Since obj files are loaded lazily, in order to set up breakpoints for a
component build, the program needs to run at least once. Add a notice
regarding this behaviour.

Bug: 1044564
Change-Id: Id2b90ebcbc658d1d2ad84b4fb8d09ac9a83e16db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014967
Reviewed-by: Nico Weber <[email protected]>
Commit-Queue: Henrique Ferreiro <[email protected]>
Cr-Commit-Position: refs/heads/master@{#734446}
1 file changed