Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove unnecessary assembly code.

The compiler should generate lw/sw corresponding to register
operations.

xlpge : driver for XLP network accelerator

Features:
- network driver for the four 10G interfaces and two management ports
on XLP 8xx.
- Support 4xx and 3xx variants of the processor.
- Source code and firmware building for the 16 mips32r2 micro-code engines
in the Network Accelerator.
- Basic initialization code for Packet ordering Engine.

Submitted by: Prabhath Raman (prabhath at netlogicmicro com)
[refactored and fixed up for style by jchandra]