Rename TemplateArgument::getTypeForDecl to getParamTypeForDecl for clarity

Code review feedback from Richard Smith on r219900.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@220060 91177308-0d34-0410-b5e6-96231b3b80d8
Move test/CodeGen/sections.c to CodeGenCXX/sections.cpp

The test was running with -xc++. Seems it wants to be a C++ file.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@220069 91177308-0d34-0410-b5e6-96231b3b80d8