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cc2: Differentiate between variable and machine register

The actions performed for a register variable are different to
the actions for a machine register. For this reason is  needed
a way to differentiate between them, otherwise we can  confuse
integer constants and symbol pointers (the u value of  machine
registers and register variables).

--- a/src/cmd/cc/cc2/cc2.h

+++ b/src/cmd/cc/cc2/cc2.h

@@ -59,6 +59,7 @@

 	OTMP     = 'N',

 	OAUTO    = 'A',

 	OREG     = 'R',

+	OMREG    = 'G',

 	OCONST   = '#',

 	OSTRING  = '"',

 	OLOAD    = 'D',

--- a/src/cmd/cc/cc2/code.c

+++ b/src/cmd/cc/cc2/code.c

@@ -34,10 +34,7 @@

 	Symbol *sym;

 	switch (np->op) {

-	case OREG:

-		/* TODO:

-		 * At this moment this op is used also for register variables

-		 */

+	case OMREG:

 		addr->kind = SREG;

 		addr->u.reg = np->u.reg;

 		break;

@@ -46,6 +43,7 @@

 		/* TODO: Add support for more type of constants */

 		addr->u.i = np->u.i;

 		break;

+	case OREG:

 	case OTMP:

 	case OLABEL:

 	case OAUTO: