Handlers are represented as a "compile server" even though
right now it can really only handle a single
compile request.

Then there can be a commandline-based server and a
browser-based server. This server takes over the main
thread. In the browser-based case the server can block,
waiting on bytes to be pushed. This becomes a producer of
bitcode bytes.

The original main thread which did bitcode reading is now
shifted to yet another worker thread, which is then the
consumer of bitcode bytes.

This uses an IRT interface for listening to messages
from the browser:
https://codereview.chromium.org/984713003/

TEST=Build the IRT core nexe w/ the above patch and compile w/ something like:

echo """
readwrite_file objfile /tmp/temp.nexe---gcc.opt.stripped.pexe---.o
rpc StreamInitWithSplit i(4) h(objfile) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) C(4,-O2\x00) * s()
stream_file /usr/local/google/home/jvoung/pexe_tests/gcc.opt.stripped.pexe 65536 1000000000
rpc StreamEnd * i() s() s() s()
echo "pnacl-sz complete"
""" | scons-out/opt-linux-x86-32/staging/sel_universal \
    -a -B scons-out/nacl_irt-x86-32/staging/irt_core.nexe \
    --abort_on_error \
    -- toolchain/linux_x86/pnacl_translator/translator/x86-32/bin/pnacl-sz.nexe

echo """
readwrite_file nexefile /tmp/temp.nexe.tmp
readonly_file objfile0 /tmp/temp.nexe---gcc.opt.stripped.pexe---.o
rpc RunWithSplit i(1) h(objfile0) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(invalid) h(nexefile) *
echo "ld complete"
""" | /usr/local/google/home/nacl3/native_client/scons-out/opt-linux-x86-32/staging/sel_universal \
    --abort_on_error \
    -a -B \
    scons-out/nacl_irt-x86-32/staging/irt_core.nexe \
    -E NACL_IRT_OPEN_RESOURCE_BASE=toolchain/linux_x86/pnacl_translator/translator/x86-32/lib/ \
    -E NACL_IRT_OPEN_RESOURCE_REMAP=libpnacl_irt_shim.a:libpnacl_irt_shim_dummy.a \
    -- toolchain/linux_x86/pnacl_translator/translator/x86-32/bin/ld.nexe

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4091
R=kschimpf@google.com, stichnot@chromium.org

Review URL: https://codereview.chromium.org/997773002