[profiling] Move option declarations into headers

This will make it possible to add visibility attributes to these
variables.  This also fixes some type mismatches between the
declaration and the definition.

Reviewed By: bogner, huangjd

Differential Revision: https://reviews.llvm.org/D156599

GitOrigin-RevId: e7247f1010b546ca4d98a6ee40414d2d1cae0381
7 files changed