Add more test cases for IF, REPT, and MACRO (#748)

test/asm/code-after-endm-endr-endc.asm

@@ -0,0 +1,27 @@
+println "start"
+
+; will not define 'mac'
+mac: MACRO
+	println \1
+ENDM println "<_<"
+	mac "argument"
+
+; will not repeat
+REPT 3
+	println "hey!"
+ENDR println "<_<"
+
+IF 0
+	println "skipped"
+	bad syntax!?
+ELSE println "<_<"
+	println "else clause"
+ENDC println "<_<"
+
+IF 1
+	println "if clause"
+ELSE println "<_<"
+	println "not skipped"
+ENDC println "<_<"
+
+println "done"