Richard Smith 0848210b74 Fix some -Wexceptions false positives. ...

Reimplement the "noexcept function actually throws" warning to properly handle
nested try-blocks. In passing, change 'throw;' handling to treat any enclosing
try block as being sufficient to suppress the warning rather than requiring a
'catch (...)'; the warning is intended to be conservatively-correct.

llvm-svn: 325545

2018-02-20 02:32:30 +00:00

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