Make tooling::applyAllReplacements return llvm::Expected<string> instead of...

Make tooling::applyAllReplacements return llvm::Expected<string> instead of empty string to indicate potential error.

Summary:
return llvm::Expected<> to carry error status and error information.
This is the first step towards introducing "Error" into tooling::Replacements.

Reviewers: djasper, klimek

Subscribers: ioeric, klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D21601

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275062 91177308-0d34-0410-b5e6-96231b3b80d8