Reland "[lldb] Make CommandInterpreter's execution context the same as debugger's one"

lldb/test/API/python_api/debugger/main.cpp

@@ -0,0 +1,9 @@
+// This simple program is to test the lldb Python API SBDebugger.
+
+int func(int val) {
+    return val - 1;
+}
+
+int main (int argc, char const *argv[]) {
+    return func(argc);
+}