[Bug jit/63854] Fix memory leaks seen in JIT

[ienkovich at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63854
Bug 63854 depends on bug 64003, which changed state.

Bug 64003 Summary: valgrind complains about get_attr_length_nobnd in 
insn-attrtab.c from i386.md
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64003

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED