Thread '--lldb-obj-root' through lldb-dotest for manual testing

(cherry picked from commit 4cd11c9)

Author: adrian-prantl

lldb/utils/lldb-dotest/lldb-dotest.in

@@ -14,6 +14,7 @@ lldb_build_intel_pt = "@LLDB_BUILD_INTEL_PT@"
 lldb_framework_dir = "@LLDB_FRAMEWORK_DIR_CONFIGURED@"
 lldb_libs_dir = "@LLDB_LIBS_DIR_CONFIGURED@"
 llvm_tools_dir = "@LLVM_TOOLS_DIR_CONFIGURED@"
+lldb_obj_root = "@LLDB_BINARY_DIR@"
 has_libcxx = @LLDB_HAS_LIBCXX@
 libcxx_libs_dir = "@LIBCXX_LIBRARY_DIR@"
 libcxx_include_dir = "@LIBCXX_GENERATED_INCLUDE_DIR@"
@@ -48,6 +49,7 @@ if __name__ == '__main__':
         cmd.extend(['--framework', lldb_framework_dir])
     if lldb_build_intel_pt == "1":
         cmd.extend(['--enable-plugin', 'intel-pt'])
+    cmd.extend(['--lldb-obj-root', lldb_obj_root])
     cmd.extend(wrapper_args)
     # Invoke dotest.py and return exit code.
     print(' '.join(cmd))