xStore, xLoad should have base latency 0

[r15725]

ir/be/ia32/ia32_spec.pl

@@ -1434,7 +1434,7 @@ xLoad => {
 	attr      => "ir_mode *load_mode",
 	init_attr => "attr->ls_mode = load_mode;",
 	outs      => [ "res", "M" ],
-	latency   => 2,
+	latency   => 0,
 	units     => [ "SSE" ],
 },
 
@@ -1442,8 +1442,8 @@ xStore => {
 	op_flags => "L|F",
 	state    => "exc_pinned",
 	reg_req  => { in => [ "gp", "gp", "xmm", "none" ] },
-	emit     => '. mov%XXM %SI2, %AM',
-	latency  => 2,
+	emit     => '. mov%XXM %S2, %AM',
+	latency  => 0,
 	units    => [ "SSE" ],
 	mode     => "mode_M",
 },
@@ -1454,7 +1454,7 @@ xStoreSimple => {
 	reg_req  => { in => [ "gp", "gp", "xmm", "none" ] },
 	ins      => [ "base", "index", "val", "mem" ],
 	emit     => '. mov%XXM %S2, %AM',
-	latency  => 2,
+	latency  => 0,
 	units    => [ "SSE" ],
 	mode     => "mode_M",
 },