Make to_immediate/from_immediate configurable by backends

librustc_codegen_ssa has the concept of an immediate vs. memory type,
and librustc_codegen_llvm uses this distinction to implement bools being
i8 in memory, and i1 in immediate contexts. However, some of that
implementation leaked into codegen_ssa when converting to/from immediate
values. So, move those methods into builder traits, so that behavior can
be configured by backends.

This is useful if a backend is able to keep bools as bools, or, needs to
do more trickery than just bools to bytes.

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