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This pulls in the following Native Client changes:

r13667: (yyanagisawa) Re-enable use of Goma on Windows, except when using the PNaCl toolchain
r13668: (noelallen) Force rebuild on cmd change.
r13669: (dbrazdil) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r13670: (mseaborn) Fix munmap() with length > 0xffff0000 to behave consistently on 32/64-bit
r13671: (mseaborn) Add comment about updating the trybot list in the Commit Queue's code
r13672: (dschuff) Expose LLC's -force-align-stack flag to pnacl-translate
r13673: (dschuff) PNaCl: Update libc++ revision in pnacl/COMPONENT_REVISIONS
r13674: (mseaborn) Use uint32_t for untrusted pointer args: sysconf() and other syscalls
r13675: (mseaborn) Revert r13667: "Re-enable use of Goma on Windows, except when using the PNaCl toolchain"

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32,linux_arm_cross_compile,linux_nacl_sdk_build

Review URL: https://codereview.chromium.org/516123002

Cr-Commit-Position: refs/heads/master@{#292647}