nir: replace nir_move_load_const() with nir_opt_sink()

This is mostly the same as nir_move_load_const() but can also move
undef instructions, comparisons and some intrinsics (being careful with
loops).

v2: actually delete nir_move_load_const.c
v3: fix nir_opt_sink() usage in freedreno
v3: update Makefile.sources
v4: replace get_move_def with nir_can_move_instr and nir_instr_ssa_def
v4: handle if uses
v4: fix handling of nested loops
v5: re-write adjust_block_for_loops
v5: re-write setting of use_block for if uses

Signed-off-by: Rhys Perry <[email protected]>
Co-authored-by: Daniel Schürmann <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

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