[Bug c/12245] [4.9/5/6/7 regression] Uses lots of memory when compiling large initialized arrays

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12245

--- Comment #60 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 5 should have improved things a bit by wide-ints as small INTEGER_CSTs now
use 8 bytes less memory.  A quick check with GCC 6 shows around ~200MB memory
use for the attached testcase.

Note that your last example uses C++ initializer lists which have its own
issue (quite expensive wrapping) and separate bugreports.