Turn off background compilation when running with --verify_gc, since the background compilation con…

Turn off background compilation when running with --verify_gc, since the background compilation constantly forces mutator thread to reach safepoint and vice versa. This can take too much time. Add a different source-code position for UNREACHABLE in AbstractType::IsInstantiated to analyze very rare crashes

BUG=
R=regis@google.com

Committed: https://github.com/dart-lang/sdk/commit/d109b17eadf36896ee2de29cc54ff54fa4d7bd48

[srdjan, 2016-04-22 21:08:48]

srdjan@google.com changed reviewers:
+ regis@google.com

[regis, 2016-04-22 22:30:59]

LGTM

[srdjan, 2016-04-22 22:38:05]

Description was changed from

==========
Turn off background compilation when running with --verify_gc, since the
background compilation constantly forces mutator thread to reach safepoint and
vice versa. This can take too much time. Add a different source-code position
for UNREACHABLE in AbstractType::IsInstantiated to analyze very rare crashes

BUG=
==========

to

==========
Turn off background compilation when running with --verify_gc, since the
background compilation constantly forces mutator thread to reach safepoint and
vice versa. This can take too much time. Add a different source-code position
for UNREACHABLE in AbstractType::IsInstantiated to analyze very rare crashes

BUG=
R=regis@google.com

Committed:
https://github.com/dart-lang/sdk/commit/d109b17eadf36896ee2de29cc54ff54fa4d7bd48
==========

[srdjan, 2016-04-22 22:38:06]

Committed patchset #1 (id:1) manually as
d109b17eadf36896ee2de29cc54ff54fa4d7bd48 (presubmit successful).