shader: lower more integer forms

Forms Fire Emblem: Fortune's Weave's shaders use that the lowering
rejected, mostly 64-bit address and index arithmetic:

- ISETP.EX: EQ/NE as the high comparison ANDed/ORed with the low words'
  predicate, unsigned LT/LE/GT/GE as (hi < or > hi) || (hi == hi && low).
- IMAD.HI signed (bit 73), and with a constant buffer multiplier (0xa27).
- IMAD.X Rd, Ra, 1, Rc, Pn (an add with carry).
- IADD3.X with a register first source or a uniform operand, and IADD3
  with a uniform operand and a carry out.
- LEA.HI.X (carry in) with a register base, and LEA.HI.X.SX32 with a
  constant base.
- SHF with a constant buffer shift amount (0xa19).
- IMNMX with a negative immediate.
- F2I.FTZ.U64.TRUNC (0x311).

Assisted-by: Claude Opus 5.5 (debugging, implementation and drafting)
Signed-off-by: duck912 <350528965+Duck912@users.noreply.github.com>
Signed-off-by: Duck912 <350528965+Duck912@users.noreply.github.com>

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