NSS Optimize (x86_64)

I open a new bug to x64 optimization for nss. This patch is improved DES (2-3% up)　and SHA512 (5% up). On Windows, SHA512 improves 8-10% up.

Bug 431958 – Improve DES and SHA512 for x86_64 platform

Firefox Performance on Linux (Ubuntu 8.04)

JavaScirpt benchmark for x86 build and x64 build on Ubuntu 8.04 using dromaeo by Mozilla.