[mlir][bytecode] Fix crashes when reading bytecode with unsupported types (#186354) When using test-kind=2 in the bytecode roundtrip test, integer types (i32) are replaced by a custom type (TestI32Type) via a type callback. This exposed two crash scenarios: 1. Reading IntegerAttr with an unsupported type: `getIntegerBitWidth` returns 0 for unsupported types and emits an error, but `readAPIntWithKnownWidth` would proceed to call `reader.readAPIntWithKnownWidth(0)`, creating a zero-width APInt with a potentially non-zero value. Fix: early-return failure when `bitWidth == 0`. 2. Reading VectorType with an unsupported element type: `VectorType::get` asserts that the element type implements VectorElementTypeInterface. When the element type is replaced by a custom type that doesn't implement this interface, the program crashes. Fix: use `VectorType::getChecked` with a diagnostic emitter lambda instead of `get<VectorType>` in the bytecode builder. Fixes #128312
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