Roll src/native_client/ ac9486116..4bf729db8 (4 commits).
Roll src/native_client/ ac9486116..4bf729db8 (4 commits).

https://chromium.googlesource.com/native_client/src/native_client.git/+log/ac9486116283..4bf729db8483

$ git log ac9486116..4bf729db8 --date=short --no-merges --format='%ad %ae %s'
2016-04-02 stichnot Update revision for PNaCl
2016-04-02 mseaborn PNaCl dynamic linking: Implement per-thread instantiation of TLS variables
2016-04-01 stichnot PNaCl: Update subzero revision in pnacl/COMPONENT_REVISIONS
2016-04-01 mseaborn ARM Non-SFI: Fix TLS layout mismatch that causes corruption of TLS variables

CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_dbg_32_ng,linux_nacl_sdk_build
TBR=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/1852053002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#384814}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk