UserAgent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0

Steps to reproduce the problem:
1. Get nacl
$ cd /opt/subzero
$ mkdir /opt/subzero/nacl
$ cd /opt/subzero/nacl
$ fetch nacl
$ cd /opt/subzero/nacl/native_client
$ git checkout master
$ build/package_version/package_version.py --packages linux_x86/mips_trusted sync -x

2. Update depot-tools
$ cd /opt/depot-tools
$ git pull

3. Get pnacl_newlib_raw
$ cd /opt/subzero/nacl/native_client
$ gclient sync
$ toolchain_build/toolchain_build_pnacl.py -y --sync-only
$ toolchain_build/toolchain_build_pnacl.py --verbose --sync --clobber --install toolchain/linux_x86/pnacl_newlib_raw
$ rm -rf toolchain/linux_x86/pnacl_newlib
$ ln -s pnacl_newlib_raw toolchain/linux_x86/pnacl_newlib
$ toolchain_build/toolchain_build_pnacl.py --verbose --install toolchain/linux_x86/pnacl_newlib_raw --build-sbtc

4. Build Subzero
$ cd /opt/subzero/nacl/native_client/toolchain_build/src/subzero
$ git checkout master
$ git pull
$ rm -rf build
$ make -j6 -f Makefile.standalone DEBUG=1

What is the expected behavior?

What went wrong?
Subzero buildbot started failing on the build step with 4 errors:

src/IceTargetLoweringARM32.cpp:5126:33: error: lambda capture 'Instr' is not used [-Werror,-Wunused-lambda-capture]
          [this, Expected, New, Instr, DestTy, &LoadedValue](Variable *Tmp) {
                                ^
src/IceTargetLoweringARM32.cpp:5126:40: error: lambda capture 'DestTy' is not used [-Werror,-Wunused-lambda-capture]
          [this, Expected, New, Instr, DestTy, &LoadedValue](Variable *Tmp) {
                                       ^
src/IceTargetLoweringARM32.cpp:5157:31: error: lambda capture 'Instr' is not used [-Werror,-Wunused-lambda-capture]
        [this, Expected, New, Instr, DestTy, &LoadedValue](Variable *Tmp) {
                              ^
src/IceTargetLoweringARM32.cpp:5157:38: error: lambda capture 'DestTy' is not used [-Werror,-Wunused-lambda-capture]
        [this, Expected, New, Instr, DestTy, &LoadedValue](Variable *Tmp) {
                                     ^

Link to latest build log:
http://www.rt-rk.com/yamb/builders/subzero_build_full/builds/47/steps/shell_15/logs/stdio

Link to all builder steps:
http://www.rt-rk.com/yamb/builders/subzero_build_full/builds/47

The last successful build was on May 21. 2017.
The first unsuccessful build was on May 28. 2017.

Did this work before? Yes 

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