Fix logic for locating dartfmt

Fix logic for locating dartfmt

When dartfmt is run as part of tests to verify that code generation is
up to date, the directory containing the resolved executable is
sometimes .../out/Release.../, but dartfmt is located in
.../out/Release.../dart-sdk/bin/dartfmt.  So we need to look in both
the resolved executable directory and in dart-sdk/bin for dartfmt.

R=devoncarew@google.com

Committed: https://github.com/dart-lang/sdk/commit/19e1f44be36828301cf6c5d53c5acf960dd27e0e

[Paul Berry, 2017-08-15 19:48:16]

paulberry@google.com changed reviewers:
+ devoncarew@google.com, kmillikin@google.com

[devoncarew, 2017-08-15 20:29:33]

lgtm

> .../out/Release.../

Hmm, interesting. I would have thought that we could rely on the resolved vm
being on dart-sdk/bin.

[Paul Berry, 2017-08-15 20:32:34]

Description was changed from

==========
Fix logic for locating dartfmt

When dartfmt is run as part of tests to verify that code generation is
up to date, the directory containing the resolved executable is
sometimes .../out/Release.../, but dartfmt is located in
.../out/Release.../dart-sdk/bin/dartfmt.  So we need to look in both
the resolved executable directory and in dart-sdk/bin for dartfmt.
==========

to

==========
Fix logic for locating dartfmt

When dartfmt is run as part of tests to verify that code generation is
up to date, the directory containing the resolved executable is
sometimes .../out/Release.../, but dartfmt is located in
.../out/Release.../dart-sdk/bin/dartfmt.  So we need to look in both
the resolved executable directory and in dart-sdk/bin for dartfmt.

R=devoncarew@google.com

Committed:
https://github.com/dart-lang/sdk/commit/19e1f44be36828301cf6c5d53c5acf960dd27e0e
==========

[Paul Berry, 2017-08-15 20:32:35]

Committed patchset #1 (id:1) manually as
19e1f44be36828301cf6c5d53c5acf960dd27e0e (presubmit successful).