[Bug c/60101] [4.7/4.8/4.9 Regression] Long compile times when mixed complex floating point datatypes are used in lengthy expressions

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60101

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 32103
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32103&action=edit
WIP patch

And just for completeness, I'm attaching my WIP (about 50% of work done) patch
to introduce the hash tables.  But, if this new testcase doesn't need it,
perhaps there is no point in hacking on that further, unless we hit it on
larger testcases.