This patch adds a script written by Nick for bug #13172 to clean up the
usage of ==, !=, <, >, <=, and >= by replacing them with their symbolic
OP_* counterpart. This will ensure that a tool like Coccinelle doesn't
get confused and silently ignore large blocks of code.
Coccinelle is a semantic patching tool that can automatically change
C code via semantic patching.
This script also replaces realloc with reallocarray as appropriate.