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Author SHA1 Message Date
Richard Smith dc1f042171 [modules] Don't emit initializers for VarDecls within a module eagerly whenever 
we first touch any part of that module. Instead, defer them until the first
time that module is (transitively) imported. The initializer step for a module
then recursively initializes modules that its own headers imported.

For example, this avoids running the <iostream> global initializer in programs
that don't actually use iostreams, but do use other parts of the standard
library.

llvm-svn: 276159
 2016-07-20 19:10:16 +00:00
Richard Smith 13fb860c78 Revert r275481, r275490. This broke modules bootstrap. 
llvm-svn: 275624
 2016-07-15 21:33:46 +00:00
Richard Smith 6b016c1575 Add test inputs missed by r275481. 
llvm-svn: 275490
 2016-07-14 22:15:06 +00:00