clang-format: [JS] merge requoting replacements.

Summary:
When formatting source code that needs both requoting and reindentation,
merge the replacements to avoid erroring out for conflicting replacements.

Also removes the misleading Replacements parameter from the
TokenAnalyzer API.

Reviewers: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D24155

llvm-svn: 280487