libgo patch committed: Don't use PtraceRegs if not defined

[Ian Lance Taylor]

The libgo library only defines PtraceRegs on a few systems.  However, it
was using PtraceRegs on every GNU/Linux system.  This patch fix this
taking the easy way out, by moving a copy of the two small functions
which use PtraceRegs into the processor-specific files which define
PtraceRegs.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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