[LLDB] Cherry-pick swift async unwinding fixes #9069
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(cherry picked from commit 2672795)
This will enable subsequent commits to introduce calls to other member functions from that method. (cherry picked from commit bffca2b)
(cherry picked from commit 4e5e68f)
Variables are never available in the prologue of a function. By unwinding the pc of the virtual frames as the first instruction of the continuation function, LLDB is unable to display any variable information. This patch addresses the issue by computing the continuation pointer from the context of the function being unwound, and then querying the continuation's SymbolContext to determine its prologue size. (cherry picked from commit 85069c8)
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