On some systems, size_t does not alias any of the fixed-size, unsigned
integer types and therefore needs to be treated explicitly in
`JITLambdaArgumentAdaptor::addArgument` to prevent the function from
failing with an unknown argument type.
Closes issue #369: Bug: MacOS tests failing on master due to
IntLambdaArgument<size_t>.
Quick fix due to ordering of includes, had to add #include
<mlir/Transforms/DialectConversion.h> to include/concretelang/Conversion/Utils/GenericOpTypeConversionPattern.h
