lldb: refactor plugin and test scripts

_lldb/runlldb.sh

@@ -2,5 +2,17 @@
 
 set -e
 
-go run ./cmd/llgo build -o ./cl/_testdata/debug/out -dbg ./cl/_testdata/debug/
-lldb -O "command script import _lldb/llgo_plugin.py" ./cl/_testdata/debug/out
+# Source common functions and variables
+source "$(dirname "$0")/common.sh"
+
+# Check if a package path is provided as an argument
+package_path="$DEFAULT_PACKAGE_PATH"
+if [ $# -eq 1 ]; then
+    package_path="$1"
+fi
+
+# Build the project
+build_project "$package_path"
+
+# Run LLDB
+"$LLDB_PATH" "${package_path}/out"