[ttl] Annotate ops for FPU

[brnorris03]

What?

Annotate the binary tile operations (add, sub, mul) that can use the FPU instead of SFPU.

Why?

FPU performance is much better (~2x) than SFPU for add, sub, mul.

How?

Binary operations are classified into three strategies based on operand provenance:

Strategy	Condition	Attribute Value	TTKernel Lowering	DST Behavior
FPU	Both operands are block arguments (from CB)	execution_target = "fpu"	add_tiles(cb0, cb1, ...)	No copy_tile for inputs
Dest-Reuse	Exactly one operand is block argument	execution_target = "dest_reuse"	binary_dest_reuse_tiles(cb, ...)	copy_tile only for CB operand
SFPU	Neither operand is block argument (both DST)	execution_target = "sfpu" or no attribute	add_binary_tile(dst0, dst1, ...)	copy_tile for both inputs

How to Test?

New MLIR test: test/ttlang/Conversion/TTLToCompute/test_annotate_binary_strategy.mlir

Future

• Add lowering (waiting for ttkernel support of necessary ops to be merged, open tt-mlir pr)

Checklist:

• Self-reviewed (style, logic)
• Added tests (or justified none needed)
• PR is small and focused (one task)