Regressions on master at commit r15-2435 vs commit r15-2433 on Linux/i686

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-2435 vs commit r15-2433 on Linux/i686
New failures:

New passes:
FAIL: gcc.target/i386/switch-exp-transform-3.c scan-tree-dump-times switchconv 
"Applying exponential index transform" 6