[Bug] Fix ret_type and cast_type of UnaryOpStmt in Scalarize #7082
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Issue: fix #6978
Brief Summary
After #7068, The
taichi_ngp
example reportsRuntimeError: [type_factory.cpp:promoted_type@222] Assertion failure: a->is<TensorType>() && b->is<TensorType>()
. The root cause is thattaichi_ngp
usesatomic_sub
on a value with type different from the destination, which will generateneg
+cast
. However, theret_type
andcast_type
ofUnaryOpStmt
produced byScalarize
aren't set correctly. This PR fixes the problem.