Regressions on master at commit r15-3284 vs commit r15-3281 on Linux/i686

[Haochen Jiang]

Regressions on master at commit r15-3284 vs commit r15-3281 on Linux/i686
New failures:

New passes:
ERROR: (DejaGnu) proc "scan-not ltrans-tree {f04 \(x} {[0-9][0-9][0-9]t.optimized} .ltrans0.ltrans" does not exist.
ERROR: gcc.dg/ipa/ipa-icf-38.c: error executing dg-final: variable is not assigned by any conversion specifiers
ERROR: libgomp.c/declare-variant-1.c: error executing dg-final: invalid command name "scan-not"