Create Memory Profiler runtime library.

This is a simple memory profiler agent that is ABI compatible with the SyzyASan RTL. It simply records detailed information about Heap API function invocations and their return values. These can in turn be analyzed in a variety of ways to indicate memory usage. The initial use of this functionality will be for recording Heap API for reuse in a Heap API performance test of the SyzyASan RTL.

BUG=
R=sebmarchand@chromium.org

Review URL: https://codereview.appspot.com/166440043