Regressions on trunk at revision 187011 vs revision 186942

[Kirill Yukhin [Intel64 Core i7 AVX]]

New failures:
FAIL: 20_util/function/cons/callable.cc (test for excess errors)

New passes:
FAIL: gcc.dg/20011021-1.c near init (test for warnings, line 30)
FAIL: gcc.dg/20011021-1.c near init (test for warnings, line 30)
FAIL: gcc.dg/pr52283.c (test for excess errors)
FAIL: gcc.dg/pr52283.c (test for excess errors)
FAIL: gcc.target/i386/bmi2-mulx32-1a.c scan-assembler-times bmi2_umulsidi3_1 1
FAIL: gcc.target/i386/bmi2-mulx32-2a.c scan-assembler-times mulx[ \\t]+[^\n]* 1