Merging r339264:

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r339264 | rksimon | 2018-08-08 17:53:14 +0200 (Wed, 08 Aug 2018) | 5 lines

[CGObjCGNU] Rename GetSelector helper method to fix -Woverloaded-virtual warning (PR38210)

As suggested by @theraven on PR38210, this patch fixes the gcc -Woverloaded-virtual warnings by renaming the extra CGObjCGNU::GetSelector method to CGObjCGNU::GetTypedSelector

Differential Revision: https://reviews.llvm.org/D50448
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_70@339555 91177308-0d34-0410-b5e6-96231b3b80d8