Update glibc revision in tools/REVISIONS
Update glibc revision in tools/REVISIONS

This brings in:

a589e0a Prepare for fast loading through mmap'ing text.

This changes the dynamic text mapping code to attempt PROT_EXEC
mapping the text and only if it fails, falling back to read-mapping
and using dyncode create.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3371
TEST= toolchain trybot
R=kmixter@chromium.org

Review URL: https://codereview.chromium.org/14049029

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11224 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client