[Transforms] Prefer static and avoid namespaces, NFC

Put 'static' on three functions in an anonymous namespace as per our
coding style.

Remove the 'namespace llvm {}' around the .cpp file and explicitly
declare the free function 'llvm::optimizeGlobalCtorsList' in 'llvm::'.
I prefer this style for free functions because the compiler will error
out if the .h and .cpp files don't agree on the function name or
prototype.

llvm-svn: 347269