Revert "[infra] Roll clang to match the version used by Flutter"

Revert "[infra] Roll clang to match the version used by Flutter"

This reverts commit 6bf2c800fda97d21c439ee8e6d3decc8d2b727c6.

There is still some strangeness with the new GN binary not wanting
to do an incremental build on top of a build that used an old GN
binary.

Committed: https://github.com/dart-lang/sdk/commit/ab422ad19409fc6d79484754e4b016b5000933a4

[zra, 2017-05-03 22:56:04]

zra@google.com changed reviewers:
+ asiva@google.com

[zra, 2017-05-03 22:56:05]

TBR

[zra, 2017-05-03 22:56:28]

Description was changed from

==========
Revert "[infra] Roll clang to match the version used by Flutter"

This reverts commit 6bf2c800fda97d21c439ee8e6d3decc8d2b727c6.

There is still some strangeness with the new GN binary not wanting
to do an incremental build on top of a build that used an old GN
binary.
==========

to

==========
Revert "[infra] Roll clang to match the version used by Flutter"

This reverts commit 6bf2c800fda97d21c439ee8e6d3decc8d2b727c6.

There is still some strangeness with the new GN binary not wanting
to do an incremental build on top of a build that used an old GN
binary.

Committed:
https://github.com/dart-lang/sdk/commit/ab422ad19409fc6d79484754e4b016b5000933a4
==========

[zra, 2017-05-03 22:56:29]

Committed patchset #1 (id:1) manually as
ab422ad19409fc6d79484754e4b016b5000933a4 (presubmit successful).

[siva, 2017-05-04 05:11:23]

lgtm