gccrs: converter: Move literal conversion out

The literal conversion code could be used for the literal_from_string
callback, this means we should move it out of the function in it's own
function. This involves a new switch, which is quite sad but we're not
yet at a performance profiling phase, there may be lower hanging fruits.

gcc/rust/ChangeLog:

	* util/rust-token-converter.cc (handle_suffix): Rework function
	to make it work with the new literal conversion function.
	(convert_literal): Add a new function to convert to a proc macro
	literal from a literal tokenptr. The function will abort if the
	pointer does not point to a literal.
	(convert): Add call to convert literal for every literal case.
	* util/rust-token-converter.h (convert_literal): Add public
	prototype.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

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