borrowck: Regions in BIR

borrowck: Regions in BIR

gcc/rust/ChangeLog:

	* checks/errors/borrowck/rust-bir-place.h (struct Lifetime):
	Extended regions and loans.
	(struct Loan): Representation of loan (result of borrowing)
	* checks/errors/borrowck/rust-bir-builder-expr-stmt.cc (ExprStmtBuilder::visit):
	Fix let stmt handling.
	* checks/errors/borrowck/rust-bir-builder-pattern.h: improved
	pattern translation
	* checks/errors/borrowck/rust-bir-builder-internal.h: region binding
	* checks/errors/borrowck/rust-bir-builder-expr-stmt.h (class ExprStmtBuilder):
	Region support.
	(class RenumberCtx): Region support.
	* checks/errors/borrowck/rust-bir-builder.h (class Builder): Region support.
	* checks/errors/borrowck/rust-bir-dump.cc (get_lifetime_name): Region support.
	(renumber_places): Region support.
	(Dump::go): Region support.
	(Dump::visit): Region support.
	(Dump::visit_lifetime): Region support.
	(Dump::visit_scope): Region support.
	* checks/errors/borrowck/rust-bir.h (class AbstractExpr): Region support.
	(struct Function): Region support.
	(class BorrowExpr): Region support.
	(class CallExpr): Region support.

Signed-off-by: Jakub Dupak <dev@jakubdupak.com>