Generate Code pass - update phi_start handle

[n0thingNoob]

No description provided.

[Copilot]

Pull request overview

This PR extends the Generate Code pass to properly handle PhiStartOp operations in addition to PhiOp operations. Previously, only PhiOp was recognized when building the reserve-to-phi mapping, causing PhiStartOp operands to remain unresolved during code generation.

• Renamed isPhi to isPhiLike to check for both PhiOp and PhiStartOp
• Added getReserveOperand helper function to correctly extract the reserve operand from both phi operation types (operand 0 for PhiOp, operand 1 for PhiStartOp)
• Updated test expectations to reflect properly resolved operands instead of "UNRESOLVED, ERROR"

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
lib/NeuraDialect/Transforms/GenerateCodePass.cpp	Adds support for PhiStartOp by introducing isPhiLike and getReserveOperand helper functions, and updating the reserve-to-phi mapping logic
test/e2e/histogram/histogram_kernel.mlir	Updates test expectation to show resolved operand [WEST, RED] instead of [UNRESOLVED, ERROR] for PHI_START instruction
test/e2e/fir/fir_kernel.mlir	Updates test expectations to show resolved operand [EAST, RED] instead of [UNRESOLVED, ERROR] for PHI_START instruction, and adds expected CTRL_MOV instruction
test/e2e/bicg/bicg_kernel.mlir	Updates test expectations to show resolved operands [$2] and [$1] instead of [UNRESOLVED, ERROR] for PHI_START instructions

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[ShangkunLi]

LGTM~