Provide way for ui tests to opt out of having their output checked.
Namely, this adds support for: * `// dont-check-compiler-stdout`, and * `// dont-check-compiler-stderr`. Obviously almost all ui tests wont want to opt into these, since the whole point of a ui test is to check the compiler ui. However, since this PR is converting run-pass into (another set of) ui tests, these header options make sense in that context. (Also this puts us into a better position for eventually turning *every* test suite into a ui test suite, by making ui-ness the default and forcing tests to opt out explicitly.)
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