IR: Fix bitcode compatability filenames

As a fixup to r223616, follow the convention of naming the files after
the LLVM release whose bitcode they're maintaining compatability with.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223623 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Bitcode/function-local-metadata.ll b/test/Bitcode/function-local-metadata.3.5.ll
similarity index 100%
rename from test/Bitcode/function-local-metadata.ll
rename to test/Bitcode/function-local-metadata.3.5.ll

diff --git a/test/Bitcode/function-local-metadata.ll.bc b/test/Bitcode/function-local-metadata.3.5.ll.bc
similarity index 100%
rename from test/Bitcode/function-local-metadata.ll.bc
rename to test/Bitcode/function-local-metadata.3.5.ll.bc