Fix parsing of array expressions.

Fix parsing of array expressions.

Array expressions were being eagerly handled
outside of Pratt parsing.

gcc/rust/ChangeLog:

	* parse/rust-parse-impl.h
	(Parser<ManagedTokenSource>::parse_expr_without_block):
	Remove direct array expression handling.

gcc/testsuite/ChangeLog:

	* rust/compile/array4.rs: New test.
	* rust/execute/torture/arrays.rs: New test.

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