gccrs: lang: Add range_inclusive_new

This patch introduces the 'range_inclusive_new' lang item to the compiler.
When the compiler encounters an inclusive range expression, it now
correctly desugars the operation into a function call targeting this
lang item instead of lowering it directly into a static struct.

gcc/rust/ChangeLog:

	* hir/rust-ast-lower-expr.cc (ASTLoweringExpr::visit): Add
	desugaring for range_inclusive_new lang item.
	* util/rust-lang-item.cc (Rust::LangItem::lang_items): Add
	range_inclusive_new to the BiMap.
	* util/rust-lang-item.h (class LangItem): Add RANGE_INCLUSIVE_NEW
	to the Kind enum.

gcc/testsuite/ChangeLog:

	* rust/compile/torture/range-lang-item1.rs: Update test to use
	the new lang item.

Signed-off-by: Enes Cevik <enes@nsvke.com>