Ruby

[ruby/prism] Make alloc interface replaceable

• Add x prefix to malloc, calloc, realloc, and free
  (eg: malloc -> xmalloc)
• By default, they are replaced with stdlib's functions at build
• You can use custom functions by defining PRISM_CUSTOM_ALLOCATOR macro

https://github.com/ruby/prism/commit/7a878af619