Regressions on master at commit r15-2052 vs commit r15-2048 on Linux/i686

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-2052 vs commit r15-2048 on Linux/i686
New failures:

New passes:
FAIL: b2test_buildid
FAIL: b2test_buildidfull