[TIRx] Improve BufferStore cast warning context

[tlopex]

This PR improves the precision-loss warning emitted while building a BufferStore.

Before this change, the warning only displayed the LHS and RHS dtypes, making it difficult to identify the failing kernel when many kernels were built together:

Warning: Casting in BufferStore may lose precision:
LHS is `T.int32`, RHS is `T.float32`, indexing lanes: 1

After this change, the warning also displays the current kernel name and the complete BufferStore node:

Warning: Casting in BufferStore may lose precision:
LHS is `T.int32`, RHS is `T.float32`, indexing lanes: 1,
kernel: `warning_kernel`

BufferStore:
A = T.Buffer((4,), "int32")
B = T.Buffer((4,))
i = T.int32()
A[i] = T.Cast("int32", B[i] + T.float32(0.5))

[tlopex]

cc @LeiWang1999

[gemini-code-assist]

Code Review

This pull request updates the BufferStore function in src/tirx/script/builder/ir.cc to enhance the warning log for precision loss during casting. It now retrieves the kernel name from the current PrimFuncFrame and appends both the kernel name and the BufferStore object to the warning message. There are no review comments, so no additional feedback is provided.

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