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i#1615: Maintain pre translation values of SIMD registers

Open John F.X. Galea requested to merge i1615-fix into master

The PR copies SIMD values prior to translation when handling signals. This won't result in corrupting SIMD values with post-translation values.

Two helper functions are introduced. These include copy_sigcontext() and restore_orig_sigcontext(). The former copies pre-translation values of the sigcontext, including SIMD regs, while the latter restores a frame's sigcontext with pre-translation values

Issue: #1615