[Bug rtl-optimization/64003] valgrind complains about get_attr_length_nobnd in insn-attrtab.c from i386.md

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64003

--- Comment #1 from dmalcolm at gcc dot gnu.org ---
Marking as "Blocks" bug 63854, since I'd prefer to get the jit entirely clean
under valgrind.