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Make 2 functions generic and improve powerpc constant handling

Doug Nazar requested to merge dougnazar/orc:misc into master

I've been working on loop shift support for powerpc, although I'm not sure if I'm going to finish it, due to how it handles unaligned loads/stores. Trying to figure out if it'll still be a win.

However, these changes stand on their own so I figured I'd upstream them first.

  • Use ORC_CODE=debug to add PROT_WRITE to the exec codemap to support gdb breakpoints
  • mmx/sse/neon/mips all had the same code to emit invariants.
  • mmx/sse/altivec all had the same code to check for float usage.
  • powerpc previously would load constants each loop and long constants would be emitted with the code stream. Move the actual values to after the epilogue and then pre-load them before the outer loop like other architectures.

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