Rework our handling of temporary objects within the conditions of

if/switch/while/do/for statements. Previously, we would end up either:

  (1) Forgetting to destroy temporaries created in the condition (!),
  (2) Destroying the temporaries created in the condition *before*
  converting the condition to a boolean value (or, in the case of a
  switch statement, to an integral or enumeral value), or
  (3) In a for statement, destroying the condition's temporaries at
  the end of the increment expression (!).

We now destroy temporaries in conditions at the right times. This
required some tweaking of the Parse/Sema interaction, since the parser
was building full expressions too early in many places.

Fixes PR7067.

llvm-svn: 103187

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