[PATCH] AST matcher for exception variables

[Aaron Ballman]

There is not currently a way to match against a variable declaration
that is an exception variable. For instance:

void f() {
  try {
    int X;
  } catch (int Y) {
  }
}

You can match int X and int Y, but you cannot currently match only int
Y. The attached patch adds a matcher to allow that, as well as test
code and documentation.

~Aaron
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