backend: Compile struct rebinding patterns

Allow matching on a struct instance and rebinding its fields to new names:

match X {
	Foo {
		field0: new_name0,
		field1: new_name1,
	} => {
		do_something(new_name0, new_name1);
	},
}

This will enable us to finish derives for PartialEq and PartialOrd but
isn't a complete implementation of these patterns yet.

gcc/rust/ChangeLog:

	* backend/rust-compile-pattern.cc (CompilePatternBindings::make_struct_access):
	New function.
	(CompilePatternBindings::visit): Properly implement patterns mentioned above
	and call make_struct_accesss.
	* backend/rust-compile-pattern.h: New declaration.

gcc/testsuite/ChangeLog:

	* rust/execute/torture/struct_pattern1.rs: New test.

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