[PATCH] D139544: [clang][dataflow] Add support for structured bindings of tuple-like types.

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

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This patch adds interpretation of binding declarations resulting from a
structured binding (`DecompositionDecl`) to a tuple-like type. Currently, the
framework only supports binding to a struct.

Because of limitations in CFG (likely a bug), the implementation requires lazy
resolution of these `BindingDecl`s. If CFG can be updated so that the
synthesized variables occur in the block *before* the `DeclStmt` containing the
`DecompositionDecl`, then we can drop the workaround that is included in this
patch.

Fixes issue #57252.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139544

Files:
  clang/lib/Analysis/FlowSensitive/Transfer.cpp
  clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
  clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
  clang/unittests/Analysis/FlowSensitive/UncheckedOptionalAccessModelTest.cpp

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