stage2: codegen for conditional branching

 * Move branch-local register and stack allocation metadata to the
   function-local struct. Conditional branches clone this data in order
   to restore it after generating machine code for a branch.
   Branch-local data is now only the instruction table mapping *ir.Inst
   to MCValue.
 * Implement conditional branching
   - Process operand deaths
   - Handle register and stack allocation metadata
 * Avoid storing unreferenced or void typed instructions into
   the branch-local instruction table.
 * Fix integer types reporting the wrong value for hasCodeGenBits.
 * Remove the codegen optimization for eliding length-0 jumps. I need to
   reexamine how this works because it was causing invalid jumps to be
   emitted.

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