[PATCH] D87335: [json] Create some llvm::Expected-based accessors

[walter erquinigo via Phabricator via llvm-commits]

wallace created this revision.
wallace added reviewers: clayborg, sammccall.
Herald added subscribers: llvm-commits, hiraditya.
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wallace requested review of this revision.

In D85705 <https://reviews.llvm.org/D85705> I found the need for such accessors in llvm::json  and I
created them in that diff. I'm moving those changes to this new diff.
The idea of these accessors is that they either return the requested JSON value  
or a error string with a descriptive message useful for the user to fix
it.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87335

Files:
  llvm/include/llvm/Support/JSON.h
  llvm/lib/Support/JSON.cpp
  llvm/unittests/Support/JSONTest.cpp

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