Fix and test for inlinings with If's and right shift not translated

[hernanmd]

This PR add a C code generator test and fix which involves inlinings with an if expression in the left side of a right shift operation. For example, Slang code like:

methodWithIfAndShiftRight: var

	^ (var < 0
		ifTrue:  [ 0 ]
		ifFalse: [ var ]) >> (var - 1 * 32)

was causing any translation which uses a similar pattern to fail, because the CIfStatementNode was asserted to be an expression. In the fix (thanks to Guille), we pass a CTernaryNode representing the if instead to correctly generates the C code.

[guillep]

LVGTM!

Thanks!!

PS: Let's wait for the CI