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Author SHA1 Message Date
Richard Smith daa69e00f5 [modules] Substantially improve handling of #undef: 
* Track override set across module load and save
 * Track originating module to allow proper re-export of #undef
 * Make override set properly transitive when it picks up a #undef

This fixes nearly all of the remaining macro issues with self-host.

llvm-svn: 213922
 2014-07-25 04:40:03 +00:00
Richard Smith 57721ac591 [modules] Fix some of the confusion when computing the override set for a macro 
introduced by finalization. This is still not entirely correct; more fixes to
follow.

llvm-svn: 213498
 2014-07-21 04:10:40 +00:00