glsl: Add 64-bit integer support for constant expressions

This just adds the new operations and add 64-bit integer support to all
the existing cases where it is needed.

v2: fix some issues found in testing.
v2.1: add unreachable (Ian), add missing int/uint pack/unpack (Dave).

v3 (idr): Rebase on top of idr's series to generate
ir_expression_operation_constant.h. In addition, this version:

    Adds missing support for ir_unop_bit_not, ir_binop_all_equal,
    ir_binop_any_nequal, ir_binop_vector_extract,
    ir_triop_vector_insert, and ir_quadop_vector.

    Removes support for uint64_t from ir_unop_abs and ir_unop_sign.

v4 (idr): "cut them down later" => Remove ir_unop_b2u64 and
ir_unop_u642b.  Handle these with extra i2u or u2i casts just like
uint(bool) and bool(uint) conversion is done.

Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Ian Romanick <[email protected]> [v2]
Reviewed-by: Matt Turner <[email protected]> [v3]
Reviewed-by: Nicolai Hähnle <[email protected]>

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