PR modula2/109969 Linking large project causes an ICE

PR modula2/109969 Linking large project causes an ICE

This patch contains a re-write of M2LexBuf.mod which removes the linked
list of token buckets and simplifies the implementation using a dynamic
array.  It contains more checking (for empty source files for example).
The patch also contains a fix for an ICE in gcc/m2/gm2-gcc/builtins.cc

gcc/m2/ChangeLog:

	PR modula2/109969
	* gm2-compiler/M2LexBuf.def (TokenToLineNo): Rename parameter.
	(TokenToColumnNo): Rename parameter.
	(TokenToLocation): Rename parameter.
	(FindFileNameFromToken): Rename parameter.
	(DumpTokens): Rewrite comment.
	* gm2-compiler/M2LexBuf.mod: Rewrite.
	* gm2-compiler/P0SyntaxCheck.bnf (CheckInsertCandidate):
	DumpTokens before and after inserting recovery token.
	* gm2-gcc/m2builtins.cc (do_target_support_exists): Add
	bf_c99_compl case.
	* gm2-libs/Indexing.def (InitIndexTuned): New procedure
	function.
	(IsEmpty): New procedure function.
	* gm2-libs/Indexing.mod (InitIndexTuned): New procedure
	function.
	(IsEmpty): New procedure function.
	(Index): New field GrowFactor.
	(PutIndice): Use GrowFactor to extend dynamic array.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>