lastchange: don't check git state for whether the tree is dirty

lastchange: don't check git state for whether the tree is dirty

We don't show whether the tree was dirty for SVN.

Because lastchange runs on every build, these commands impact every
build.  The call to "git checkout" makes git stat every file in the
repository (including ones unrelated to the build).

This change makes a Ninja build of Chrome 20% faster.  I've seen the
command take tens of seconds on a cold disk, and it likely has a
larger impact on Windows where the disk is slower.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=117352

[haraken, 2012-01-11 23:50:13]

On 2012/01/11 19:37:38, Evan Martin wrote:

LGTM

> This change makes a Ninja build of Chrome 20% faster.

Really great! Thanks for the fix!

[commit-bot: I haz the power, 2012-01-11 23:57:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/evan@chromium.org/9148030/1

[commit-bot: I haz the power, 2012-01-12 01:46:34]

Change committed as 117352