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

This pulls in the following Subzero changes:

9a63bab: (stichnot@chromium.org) Subzero: With -asm-verbose, make the predecessor list more compact.
b36757e: (stichnot@chromium.org) Subzero: Fix nondeterministic behavior in constant pool creation.
ebbb591: (stichnot@chromium.org) Subzero: Improve lowering sequence for "a=b*b".
578f116: (jpp@chromium.org) Subzero. Enable Atomics in ARM.
e11f878: (sehr@chromium.org) Use three-address form of imul
487bad0: (sehr@chromium.org) Generate better two address code by using commutativity
57d31ac: (kschimpf@google.com) Make sure that all globals are internal, except for "start" functions.
3e53dc9: (kschimpf@google.com) Create local copy of Dart assembler code.
a313a12: (kschimpf@google.com) Add correction message to bad linkage error.
a00b1f7: (stichnot@chromium.org) Subzero: Remove trailing whitespace.
69a85b1: (stichnot@chromium.org) Subzero: Change aliases_init --> alias_init for consistency.
485d077: (stichnot@chromium.org) Subzero: Don't "and" i1 values with 1.
e741871: (stichnot@chromium.org) Subzero: Don't bother printing stack/frame ptr as part of LiveIn/LiveOut.
c5abdc1: (kschimpf@google.com) Start incorporating the ARM integrated assembler.
4001c93: (stichnot@chromium.org) Subzero: Implement "second-chance bin-packing" for register allocation.
28b71be: (stichnot@chromium.org) Subzero: Consider all instruction variables for register preference.
85342a7: (kschimpf@google.com) Fix emission of move immediate for ARM integrated assembler.
372bdd6: (kschimpf@google.com) Add "add immediate" instruction to the ARM integrated assembler.
e345505: (kschimpf@google.com) Add "sub immediate" instruction to the ARM integrated assembler.
5c87542: (sehr@chromium.org) Optimize 64-bit compares with zero
1fb030c: (stichnot@chromium.org) Subzero: Various fixes in preparation for x86-32 register aliasing.
745ad1d: (kschimpf@google.com) Handle stack spills in ARM integrated assembler.
afc92af: (jpp@chromium.org) Subzero. Misc ARM32 bugfixes.
4e10aa2: (stichnot@chromium.org) Subzero: Add -allow-extern as an alias for --allow-externally-defined-symbols.
d981025: (sehr@chromium.org) Merge compares and branches
659cc4f: (stichnot@chromium.org) Subzero: Fix MINIMAL build issues.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4330
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4334
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4095
TEST= PNaCl toolchain trybots
R=kschimpf@google.com

Review URL: https://codereview.chromium.org/1406343002 .

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