[Bug tree-optimization/51683] [4.7 Regression] __builtin_memcpy etc. with constant first argument optimized away by ccp

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51683

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-27 
11:33:01 UTC ---
Created attachment 26188
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26188
gcc47-pr51683.patch

Untested fix.