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7c: fix registerization of vlong constants

--- a/sys/src/cmd/7c/gc.h

+++ b/sys/src/cmd/7c/gc.h

@@ -264,7 +264,7 @@

 void	gbranch(int);

 void	patch(Prog*, long);

 int	sconst(Node*);

-int	sval(long);

+int	sval(vlong);

 void	gpseudo(int, Sym*, Node*);

 int	usableoffset(Node*, vlong, Node*);

--- a/sys/src/cmd/7c/reg.c

+++ b/sys/src/cmd/7c/reg.c

@@ -551,7 +551,7 @@

 {

 	Var *v;

 	int i, t, n, et, z;

-	long o;

+	vlong o;

 	Bits bit;

 	Sym *s;

@@ -566,7 +566,7 @@

 	if(s == S) {

 		if(t != D_CONST || !docon || a->reg != NREG)

 			goto none;

-		et = TLONG;

+		// et = TLONG;

 	}

 	if(t == D_CONST) {

 		if(s == S && sval(o))

--- a/sys/src/cmd/7c/txt.c

+++ b/sys/src/cmd/7c/txt.c

@@ -1315,7 +1315,7 @@

 }

 int

-sval(long v)

+sval(vlong v)

 {

 	return isaddcon(v) || isaddcon(-v);

 }