PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS
PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS

This pulls in the following Clang change:

e500f84: (dschuff@chromium.org) Cherrypick upstream r238048 Make unique section names the default again.

BUG=none
TEST= PNaCl toolchain trybots
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1191493005.

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client