[Bug lto/54811] [4.8 regression] tree code '=?UTF-8?Q?=EF=BF=BD?=' is not supported in LTO streams

[dehao at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54811

--- Comment #2 from dehao at gcc dot gnu.org 2012-10-04 16:33:00 UTC ---
I think in clear_unused_block_pointer, we already removed all block for debug
statements.