GN: On Linux still fallback to GCC for ARM64 build.

GN: On Linux still fallback to GCC for ARM64 build.

We don't have clang arm64 toolchain.

BUG=
R=kustermann@google.com, sortie@google.com

Committed: https://github.com/dart-lang/sdk/commit/c162e0f011a019b21d17e16c6c39b2e228e11dc0

[Vyacheslav Egorov (Google), 2017-05-08 08:32:18]

Description was changed from

==========
GN: On Linux still fallback to GCC for ARM64 build.

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

to

==========
GN: On Linux still fallback to GCC for ARM64 build.

We don't have clang arm64 toolchain.

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

[Vyacheslav Egorov (Google), 2017-05-08 08:32:18]

vegorov@google.com changed reviewers:
+ kustermann@google.com, zra@google.com

[Vyacheslav Egorov (Google), 2017-05-08 08:32:25]

PTAL

[sortie, 2017-05-08 08:35:38]

sortie@google.com changed reviewers:
+ sortie@google.com

[sortie, 2017-05-08 08:35:39]

lgtm, thanks!

[kustermann, 2017-05-08 09:24:34]

lgtm

[Vyacheslav Egorov (Google), 2017-05-08 09:30:35]

Description was changed from

==========
GN: On Linux still fallback to GCC for ARM64 build.

We don't have clang arm64 toolchain.

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

to

==========
GN: On Linux still fallback to GCC for ARM64 build.

We don't have clang arm64 toolchain.

BUG=
R=kustermann@google.com, sortie@google.com

Committed:
https://github.com/dart-lang/sdk/commit/c162e0f011a019b21d17e16c6c39b2e228e11dc0
==========

[Vyacheslav Egorov (Google), 2017-05-08 09:30:37]

Committed patchset #2 (id:20001) manually as
c162e0f011a019b21d17e16c6c39b2e228e11dc0 (presubmit successful).