This moves the libc-internal AllocChecker API out of src/__support/CPP/new.h and updates CPP/README.md to state the intent to keep src/__support/CPP and the LIBC_NAMESPACE::cpp namespace a "pure" subset of standard C++ API polyfills.
This moves the libc-internal AllocChecker API out of src/__support/CPP/new.h and updates CPP/README.md to state the intent to keep src/__support/CPP and the LIBC_NAMESPACE::cpp namespace a "pure" subset of standard C++ API polyfills.