Add benchmark

upb_test/Makefile

@@ -0,0 +1,22 @@
+CC      = cc
+CFLAGS  = -O2 -std=c11 -D_POSIX_C_SOURCE=199309L -I. -I/usr/include -Wall -Wextra
+LDFLAGS = -lupb -lutf8_range
+
+SRCS    = hackers_bench.c hackers.upb.c hackers.upb_minitable.c
+TARGET  = hackers_bench
+
+.PHONY: all clean regen
+
+all: $(TARGET)
+
+$(TARGET): $(SRCS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+# Re-generate upb files from proto/hackers.proto
+regen:
+	protoc -I ../proto ../proto/hackers.proto \
+		--upb_out=. \
+		--upb_minitable_out=.
+
+clean:
+	rm -f $(TARGET)