ntdll: add missing RtlReAllocateHeap valgrind hook, add tests

[Alexandre Julliard]

Dan Kegel <dank at kegel.com> writes:

> More related to http://bugs.winehq.org/show_bug.cgi?id=18067
> This adds the missing valgrind hook, and adds tests that
> show up the old problem if run under valgrind.

The tests should go with the other existing heap tests in kernel32.

-- 
Alexandre Julliard
julliard at winehq.org