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ja: add "CALL" and implicit use of R1 in "JAL"

--- a/sys/src/cmd/ja/a.y

+++ b/sys/src/cmd/ja/a.y

@@ -115,6 +115,14 @@

 		outcode($1, &nullgen, NREG, &nullgen);

 	}

+|	LCALL addr

+	{

+		outcode($1, &nullgen, REGLINK, &$2);

+	}

+|	LCALL rel

+	{

+		outcode($1, &nullgen, REGLINK, &$2);

+	}

 |	LCALL sreg ',' addr

 	{

 		outcode($1, &nullgen, $2, &$4);

--- a/sys/src/cmd/ja/lex.c

+++ b/sys/src/cmd/ja/lex.c

@@ -300,6 +300,7 @@

 	"JAL",		LCALL,	AJAL,

 	"JALR",		LCALL,	AJAL,

+	"CALL",		LCALL,	AJAL,

 	"MOVB",		LMOVB,	AMOVB,

 	"MOVH",		LMOVB,	AMOVH,