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

This pulls in the following Subzero changes:

76bb0be: (jvoung@chromium.org) Convert Constant->emit() definitions to allow multiple targets to define them.
33492e7: (jvoung@chromium.org) Change a build-attribute REQUIRES check to use supported not requested.
a59ae6f: (stichnot@chromium.org) Subzero: Fold icmp into br/select lowering.
b3401d2: (jvoung@chromium.org) Subzero ARM: lowerArguments (GPR), basic legalize(), and lowerRet(i32, i64).
537b5ba: (stichnot@chromium.org) Subzero: Use cmov to improve lowering for the select instruction.
2971997: (jvoung@chromium.org) Lower a few basic ARM binops for i{8,16,32,64}.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4095
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4162
TEST= PNaCl toolchain trybots
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1127243005

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