Use larger pages when mapping in large ELFs

[Ivan-Velickovic]

Right now all PD ELF data is mapped in with the smallest page size, 4KB. This introduces quite a lot of overhead for large ELFs.

The most extreme example we have run into so far is when packaging a virtual machine's image into the VMM PD's ELF. In the case of a VMM managing a Linux guest, this can lead to an ELF size that is dozens of megabytes.