Golang patch accepted: add ppc64 VSX registers and instructions

Golang patch accepted: add ppc64 VSX registers and instructions

Following the trend from my previous patch, VSX instructions and registers are now enabled and available for use in pure assembly code (i.e. golang runtime arch-specific function implementations), so we can fully leverage the processor capabilities up to the POWER8 chip. These are not (yet) automatically picked by the golang compiler. Committed as 0acefdb.

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