PR modula2/119192 ICE if TBITSIZE is used in an expression

PR modula2/119192 ICE if TBITSIZE is used in an expression

This patch fixes an ICE which will occur is TBITSIZE is used
within an expression.

gcc/m2/ChangeLog:

	PR modula2/119192
	* gm2-compiler/M2GCCDeclare.def (TryDeclareType): New procedure.
	* gm2-compiler/M2GCCDeclare.mod (IsAnyType): New procedure.
	(TryDeclareType): Ditto.
	* gm2-compiler/M2GenGCC.mod (FoldTBitsize): New procedure.
	(FoldStandardFunction): Call FoldTBitsize.
	* gm2-gcc/m2expr.cc (BuildTBitSize): Improve comment.
	(m2expr_BuildSystemTBitSize): New function.
	* gm2-gcc/m2expr.def (BuildSystemTBitSize): New procedure
	function.
	* gm2-gcc/m2expr.h (m2expr_BuildSystemTBitSize): New function
	prototype.

gcc/testsuite/ChangeLog:

	PR modula2/119192
	* gm2/sets/run/pass/simplepacked.mod: Uncomment asserts.

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