PR modula2/110126 variables are reported as unused when referenced by ASM

This patches fixes two problems with the asm statement.
gm2 -Wall -c fooasm3.mod generates an incorrect warning and
gm2 cannot concatenate strings before an ASM statement.
The asm statement now accepts a constant expression (rather than
a string) and it updates the variable read/write use lists as
appropriate.

gcc/m2/ChangeLog:

	PR modula2/110126
	* gm2-compiler/M2GenGCC.mod (BuildTreeFromInterface): Remove
	tokenno parameter.  Use object tok instead of tokenno.
	(BuildTrashTreeFromInterface): Use object tok instead of
	GetDeclaredMod.
	(CodeInline): Remove tokenno from parameter list to BuildTreeFromInterface.
	* gm2-compiler/M2Quads.def (BuildAsmElement): Exported and
	defined.
	* gm2-compiler/M2Quads.mod (BuildOptimizeOff): Reformatted.
	(BuildInline): Reformatted.
	(BuildLineNo): Reformatted.
	(UseLineNote): Reformatted.
	(BuildAsmElement): New procedure.
	* gm2-compiler/P0SyntaxCheck.bnf (AsmOperands): Use
	ConstExpression instead of string.
	(AsmElement): Use ConstExpression instead of string.
	(TrashList): Use ConstExpression instead of string.
	* gm2-compiler/P1Build.bnf (AsmOperands): Use
	ConstExpression instead of string.
	(AsmElement): Use ConstExpression instead of string.
	(TrashList): Use ConstExpression instead of string.
	* gm2-compiler/P2Build.bnf (AsmOperands): Use
	ConstExpression instead of string.
	(AsmElement): Use ConstExpression instead of string.
	(TrashList): Use ConstExpression instead of string.
	* gm2-compiler/P3Build.bnf (AsmOperands): Rewrite.
	(AsmOperandSpec): Rewrite.
	(AsmOutputList): New rule.
	(AsmInputList): New rule.
	(TrashList): Rewrite.
	* gm2-compiler/PCBuild.bnf (AsmOperands): Use
	ConstExpression instead of string.
	(AsmElement): Use ConstExpression instead of string.
	(TrashList): Use ConstExpression instead of string.
	* gm2-compiler/PHBuild.bnf (AsmOperands): Use
	ConstExpression instead of string.
	(AsmElement): Use ConstExpression instead of string.
	(TrashList): Use ConstExpression instead of string.
	* gm2-compiler/SymbolTable.def (PutRegInterface):
	Rewrite interface.
	(GetRegInterface): Rewrite interface.
	* gm2-compiler/SymbolTable.mod (SetFirstUsed): New procedure.
	(PutFirstUsed): New procedure.
	(PutRegInterface): Rewrite.
	(GetRegInterface): Rewrite.

gcc/testsuite/ChangeLog:

	PR modula2/110126
	* gm2/pim/pass/fooasm3.mod: New test.

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

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