6562

The new failing test is now passing, and so is this manual test that had
been throwing a spurious error:
  fn foo {
    var a/eax: int <- copy 0
    var b/ebx: int <- copy 0
    {
      var a1/eax: int <- copy 0
      var b1/ebx: int <- copy a1
    }
    b <- copy a
  }

However, factorial.mu is still throwing a spurious error.

Some history on this commit's fix: When I moved stack-location tracking
out of the parsing phase (commit 6116, Mar 10) I thoughtlessly moved block-depth
tracking as well. And the reason that happened: I'd somehow gotten by without
ever cleaning up vars from a block during parsing. For all my tests, this
is a troubling sign that I'm not testing enough.

The good news: clean-up-blocks works perfectly during parsing.

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