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Updated random seed patchkit

From: Andi Kleen <andi at firstfloor dot org>
To: gcc-patches at gcc dot gnu dot org
Date: Wed, 28 Sep 2011 14:49:20 +0200
Subject: Updated random seed patchkit

I addressed all review comments, clarified some code.
The random seed generation in gcc.c is now fixed too and toplev.c
detects this case and doesn't rerun the CRC.

Repasses bootstrap and testsuite on x86_64-linux.

Since the previous version was approved I will commit in 24h,
unless there are new objections.

-Andi

Follow-Ups:
- [PATCH 2/3] Use urandom to get random seed
  - From: Andi Kleen
- [PATCH 3/3] Use urandom in gcc.c too
  - From: Andi Kleen
- [PATCH 1/3] Change random seeds to 64bit and drop re-crcing
  - From: Andi Kleen

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