ralloc: Introduce new macros for defining C++ new/delete operators.

Most of our C++ classes define placement new and delete operators so we
can do convenient allocation via:

   thing *foo = new(mem_ctx) thing(...)

Currently, this is done via a lot of boilerplate.  By adding simple
macros to ralloc, we can condense this to a single line, making it
trivial to add this feature to a new class.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Chad Versace <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

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