syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     //          Subtarget.isTargetWindowsItanium()) {
context_before:     //      if (Subtarget.isTargetKnownWindowsMSVC() ||
context_after:     //        // Setup Windows compiler runtime calls.