Use .cpp extension for certain tests instead of .cc

The tests `CodeGen/aapcs[64]-align.cc` are not run since files with a `.cc`
suffix aren't recognisze as tests. This patch renames the above two files to
`.cpp`.

Differential Revision: https://reviews.llvm.org/D46013

Comitting as obvious.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@339766 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/aapcs-align.cc b/test/CodeGen/aapcs-align.cpp
similarity index 100%
rename from test/CodeGen/aapcs-align.cc
rename to test/CodeGen/aapcs-align.cpp

diff --git a/test/CodeGen/aapcs64-align.cc b/test/CodeGen/aapcs64-align.cpp
similarity index 100%
rename from test/CodeGen/aapcs64-align.cc
rename to test/CodeGen/aapcs64-align.cpp