Reworked unit tests for machine and renamed test_programs directory

test/riscv_instructions/jump_instructions/Makefile

@@ -0,0 +1,6 @@
+TOPDIR = ../..
+include $(TOPDIR)/Makefile.tests
+
+dumps: jump.dump ret.dump
+
+tests: jump.guac ret.guac

test/riscv_instructions/jump_instructions/jump.c

@@ -0,0 +1,8 @@
+int test() {
+    return 0;
+}
+
+int main() {
+    int x = test();
+    return x;
+}

test/riscv_instructions/jump_instructions/ret.c

@@ -0,0 +1,3 @@
+int main() {
+    return 1;
+}