tests: move test to more appropriate location

The test is a C++ semantic analysis test, move it to SemaCXX from Sema.  NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219932 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Sema/attributed-auto-deduction.cpp b/test/SemaCXX/attributed-auto-deduction.cpp
similarity index 100%
rename from test/Sema/attributed-auto-deduction.cpp
rename to test/SemaCXX/attributed-auto-deduction.cpp