expand: Add derive proc macro draft

Add a first draft for derive proc macros based on the attribute expander
code. Convert the result back to a parsable entity and parse it.
The procedural macro expander was beginning to require almost all
functionalities already provided by the macro expander, hence the merge.

gcc/rust/ChangeLog:

	* ast/rust-ast-collector.h: Update enum name to match
	definition.
	* expand/rust-expand-visitor.cc (ExpandVisitor::expand_derive):
	Add call to expander.
	(ExpandVisitor::expand_outer_attribute):
	Change call to macro expander.
	(ExpandVisitor::expand_inner_attribute): Likewise.
	* expand/rust-expand-visitor.h: Remove const attribute to match
	visitor declaration. Attach result to the AST. Add condition for
	item erasure.
	* expand/rust-proc-macro.h: Add token collector and expansion
	call. Add lexers and parsers for each proc macro type and uses
	them to parse macro output.
	* expand/rust-macro-expand.h (struct MacroExpander): Add
	functions.
	* expand/rust-proc-macro.cc (ProcMacroExpander::import_proc_macros):
	Moved from here...
	* expand/rust-macro-expand.cc (MacroExpander::import_proc_macros):
	... to here. Unify procedural macro parsing under one function.
	Add a flag to determine whether it originate from a derive
	macro.
	(MacroExpander::parse_procmacro_output):
	Parse macro output to statements. Store an error on parsing
	failure.
	* Make-lang.in: Add const_TokenPtr specific lexer.
	* expand/rust-proc-macro-invoc-lexer.cc: New file.
	* expand/rust-proc-macro-invoc-lexer.h: New file.
	* rust-session-manager.cc (Session::expansion): Remove
	ProcMacroExpander declaration.
	* ast/rust-ast-fragment.cc (Fragment::Fragment): Add overwrite
	flag.
	(Fragment::should_overwrite): Add a getter to determine whether
	the fragment shall overwrite it's parent or be appended after.
	* ast/rust-ast-fragment.h: Add flag to declaration.

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

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