ast: Add RestPattern AST node

Add the RestPattern AST node representing ".." code in some rust
context. This commit also provides the different visitors for this node.

gcc/rust/ChangeLog:

	* ast/rust-ast-dump.cc (Dump::visit): Add visitor.
	* ast/rust-ast-dump.h: Add visitor prototype.
	* ast/rust-ast-full-decls.h (class RestPattern): Add forward
	declaration for class RestPattern.
	* ast/rust-ast-visitor.h: Add visitor prototype.
	* ast/rust-ast.cc (RestPattern::accept_vis): Add function to
	accept a foreign visitor.
	* ast/rust-pattern.h (class RestPattern): Add class RestPattern.
	* checks/errors/rust-feature-gate.h: Add visitor prototype.
	* expand/rust-attribute-visitor.cc (AttrVisitor::visit): Add
	visitor implementation.
	* expand/rust-attribute-visitor.h: Add visitor prototype.
	* hir/rust-ast-lower-base.cc (ASTLoweringBase::visit): Add
	visitor implementation.
	* hir/rust-ast-lower-base.h: Add visitor prototype.
	* resolve/rust-ast-resolve-base.cc (ResolverBase::visit): Add
	visitor implementation.
	* resolve/rust-ast-resolve-base.h: Add visitor prototype.
	* resolve/rust-early-name-resolver.cc (EarlyNameResolver::visit):
	Add visitor implementation.
	* resolve/rust-early-name-resolver.h: Add visitor prototype.
	* util/rust-attributes.cc (AttributeChecker::visit): Add visitor
	implementation.
	* util/rust-attributes.h: Add visitor prototype.

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

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