gccrs: Remove Parser::parse_path_in_expression_pratt

gccrs: Remove Parser::parse_path_in_expression_pratt

This improves our handling of PathInExpression and fixes
https://github.com/Rust-GCC/gccrs/issues/4056.

gcc/rust/ChangeLog:

	* parse/rust-parse-impl.h (Parser::parse_expr): Avoid skipping
	or splitting tokens.
	(Parser::null_denotation): Assume initial token was not skipped
	and adjust function signature to match. Use
	parse_path_in_expression instead of
	parse_path_in_expression_pratt and handle SCOPE_RESOLUTION.
	(Parser::parse_path_in_expression_pratt): Remove function.
	* parse/rust-parse.h (null_denotation): Remove initial token
	parameter.
	(parse_path_in_expression_pratt): Remove function.

gcc/testsuite/ChangeLog:

	* rust/compile/global-path-array.rs: New test.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>