Renames the isolate's mutator_thread_ to scheduled_mutator_thread_

Renames the isolate's mutator_thread_ to scheduled_mutator_thread_

The isolate's mutator_thread_ field actually represents the mutator
thread scheduled by the isolate. This was confused with the
mutator thread created by the thread_registry, which is a singleton.

R=asiva@google.com, rmacnak@google.com

Committed: https://github.com/dart-lang/sdk/commit/38aba431110c37000253846a2d9fdd7a778f02c5

[rmacnak, 2017-08-07 22:44:07]

lgtm

https://codereview.chromium.org/2999583002/diff/1/runtime/vm/base_isolate.h
File runtime/vm/base_isolate.h (right):

https://codereview.chromium.org/2999583002/diff/1/runtime/vm/base_isolate.h#n...
runtime/vm/base_isolate.h:20: // constructor/destructor for performance.
Wow, this comment is out of date :)

[danunez, 2017-08-07 22:54:52]

Description was changed from

==========
Renames the isolate's mutator_thread_ to scheduled_mutator_thread_

The isolate's mutator_thread_ field actually represents the mutator
thread scheduled by the isolate. This was confused with the
mutator thread created by the thread_registry, which is a singleton.

R=rmacnak@google.com,asiva@google.com
==========

to

==========
Renames the isolate's mutator_thread_ to scheduled_mutator_thread_

The isolate's mutator_thread_ field actually represents the mutator
thread scheduled by the isolate. This was confused with the
mutator thread created by the thread_registry, which is a singleton.

R=asiva@google.com, rmacnak@google.com

Committed:
https://github.com/dart-lang/sdk/commit/38aba431110c37000253846a2d9fdd7a778f02c5
==========

[danunez, 2017-08-07 22:54:54]

Committed patchset #1 (id:1) manually as
38aba431110c37000253846a2d9fdd7a778f02c5 (presubmit successful).