[PATCH] Fix mutex pretty printer test and pretty printer output.

[Torvald Riegel]

This fixes the test for the mutex pretty printers in that it does not
assume that the owner field is set even though the mutex is acquired;
this is not guaranteed under the current lock elision implementation.
Also, it improves the wording of some of the pretty printer output (eg,
changing 'Locked' to 'Acquired').

Tested on x86_64 with --enable-lock-elision. 
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