[PATCH] Improve error message when a stale PCH dependency is encountered

[Ben Langmuir]

This patch changes which PCH file is displayed in the error that you get when a PCH dependency is modified after the PCH is built.  Now the ‘top-level’ PCH file is shown as the culprit.  When the PCH imports a module, the previous behavior was to blame the pcm file in the module, which is misleading because fixing the pcm will just cause the PCH to fail because it refers to a stale location, whereas rebuilding the pch will also automatically rebuild the module.

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