Reapply r336660: [Modules] Autoload subdirectory modulemaps with specific LangOpts
Summary:
Reproducer and errors:
https://bugs.llvm.org/show_bug.cgi?id=37878
lookupModule was falling back to loadSubdirectoryModuleMaps when it couldn't
find ModuleName in (proper) search paths. This was causing iteration over all
files in the search path subdirectories for example "/usr/include/foobar" in
bugzilla case.
Users don't expect Clang to load modulemaps in subdirectories implicitly, and
also the disk access is not cheap.
if (AllowExtraModuleMapSearch) true with ObjC with @import ModuleName.
Reviewers: rsmith, aprantl, bruno
Subscribers: cfe-commits, teemperor, v.g.vassilev
Differential Revision: https://reviews.llvm.org/D48367
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337430
91177308-0d34-0410-b5e6-
96231b3b80d8