Merging r293134:

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r293134 | akirtzidis | 2017-01-25 18:11:50 -0800 (Wed, 25 Jan 2017) | 4 lines

[index] When indexing an ObjC method declaration use its base name for the location.

Instead of using the location of the beginning '-'/'+'.
This is consistent with location used for function decls and ObjC method calls where we use the base name as the location as well.
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_40@293303 91177308-0d34-0410-b5e6-96231b3b80d8