add makefile to regenerate test files

Author: poechsel

semanticdb/Makefile

@@ -0,0 +1,11 @@
+path="input/src/main/scala/"
+files=$(shell find $(path) -type f -name '*.scala')
+
+all: %.tasty
+	cd input; sbt compile
+
+test: all
+	cd ..; sbt dotty-semanticdb/test; cd -
+
+%.tasty: $(files)
+	cd $(dir $^); $(CURDIR)/../bin/dotc $(notdir $^)