Do not hold breakpoint lock when running the verifier

When setting a breakpoint, we need to know whether the method may be
inlined. We run the method verifier but that may cause thread
suspension. Therefore we must not hold any lock at this time. The
issue is we do hold the breakpoint lock so we fails a check in debug
mode.

This CL ensures we don't hold the breakpoint lock when running the
method verifier to detect inlining.

Bug: 17562442
(cherry picked from commit 4d1e9ab5)

Change-Id: I6daae91e3e82f41006f29959a5c6c0ec0a88194e