Regressions on trunk at revision 181249 vs revision 181200

[H.J. Lu ia32 Core 2/i7]

New failures:
FAIL: gcc.c-torture/execute/920501-1.c compilation,  -O2 -flto -fno-use-linker-plugin -flto-partition=none  (internal compiler error)
FAIL: gcc.target/i386/avx-vzeroupper-14.c scan-assembler-times avx_vzeroupper 1

New passes:
FAIL: g++.dg/lto/20100423-3 cp_lto_20100423-3_0.o assemble, -flto -g (internal compiler error)
FAIL: gcc.dg/tm/memopt-1.c scan-tree-dump-times tmmemopt "transforming: .*_ITM_RaWU8 \(&g\);" 1