Make the version of Stmt::operator new that takes ASTContext* call the ASTContext& version in Stmt inline instead of having two out of line functions that both call to the global versions.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@188648 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Do not include line/file info for artificial parameters & parameters of artificial functions

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@188651 91177308-0d34-0410-b5e6-96231b3b80d8
Fix indentation. No functional change.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@188652 91177308-0d34-0410-b5e6-96231b3b80d8