[analyzer] Rename test: cxx17-mandatory-elision.cpp -> copy-elision.cpp

It reflects its contents more accurately. No functional change intended.

llvm-svn: 338339

diff --git a/clang/test/Analysis/cxx17-mandatory-elision.cpp b/clang/test/Analysis/copy-elision.cpp
similarity index 100%
rename from clang/test/Analysis/cxx17-mandatory-elision.cpp
rename to clang/test/Analysis/copy-elision.cpp