tests: add runtime tests for regression bugs

tests/runtime/regression

@@ -0,0 +1,13 @@
+# https://github.com/iovisor/bpftrace/pull/566#issuecomment-487295113
+NAME codegen_struct_save_nested
+RUN bpftrace -e 'struct Foo { int m; struct { int x; int y; } bar; int n; } BEGIN { @foo = (Foo)0; @bar = @foo.bar; @x = @foo.bar.x; printf("done\n"); exit(); }'
+EXPECT done
+TIMEOUT 1
+
+# https://github.com/iovisor/bpftrace/issues/759
+# Update test once https://github.com/iovisor/bpftrace/pull/781 lands
+# NAME ntop_map_printf
+# RUN bpftrace -v -e 'union ip { char v4[4]; char v6[16]; } uprobe:./testprogs/ntop:test_ntop { @a = ntop(2, ((union ip*)arg0)->v4); printf("v4: %s; ", @a); @b = ntop(10, ((union ip*)arg1)->v6); exit() } END { printf("v6: %s", @b); clear(@a); clear(@b) }'
+# AFTER ./testprogs/ntop
+# EXPECT v4: 127.0.0.1; v6: ffee:ffee:ddcc:ddcc:bbaa:bbaa:c0a8:1
+# TIMEOUT 1