Add test showing optimizer failure, OptUnusedLoads removes needed loads

test/val/jmp-callax.c

@@ -0,0 +1,21 @@
+static unsigned char val;
+
+static void foo(void) {
+	val = 5;
+}
+
+static void wrap() {
+
+	asm("lda #<%v", foo);
+	asm("ldx #>%v", foo);
+	asm("jmp callax");
+
+}
+
+int main() {
+
+	val = 0;
+	wrap();
+
+	return val == 5 ? 0 : 1;
+}