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

This pulls in the following Subzero changes:

927f7cc: (stichnot@chromium.org) Subzero: Support non-IRT immediate calls with -filetype=iasm.
5dfdf5f: (stichnot@chromium.org) Subzero: Fix lowering of the fabs() intrinsic.
1f47ad0: (jvoung@chromium.org) Move some flag-like props from GlobalContext and TargetLowering to ClFlags.
27c56bf: (stichnot@chromium.org) Subzero: Fix inappropriate use of nullptr.
69d3f9c: (stichnot@chromium.org) Subzero: Prune unreachable nodes after constructing the Cfg.
f79d2cb: (stichnot@chromium.org) Subzero: Don't use key SSE instructions on potentially unaligned loads.
3e5009f: (jvoung@chromium.org) Make compile without ICE_THREAD_LOCAL_HACK (avoid "Type *TLS = TLS;")
0e432ac: (stichnot@chromium.org) Subzero: Fix a lowering bug involving xchg and xadd instructions.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4084
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4091
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4133
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4083
TEST= PNaCl toolchain trybots
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/998823006

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