RFR: 8072128: Fixed missing "++" in _mutex_array[] initialization.

[Max Ockner]

Thanks to Frederic Parain and David Holmes for reviewing this. I will 
commit it now.

Max Ockner

On 3/17/2015 12:42 AM, David Holmes wrote:
> Reviewed!
>
> Thanks Max!
>
> David
>
> On 17/03/2015 2:17 AM, Max Ockner wrote:
>> Hello,
>> Please review this small fix.
>>
>> Bug ID: 8072128
>> Webrev: http://cr.openjdk.java.net/~mockner/8072128/
>> Summary:  The fix for bug 8047290 introduced a bug in mutexLocker.cpp in
>> which the index into _mutex_array[] never increments. The bug did not
>> cause any test failures, and was caught upon inspection of an hs_err
>> file which claimed that no locks were owned.  The solution was to
>> restore the original code which increments the index.
>>
>> Tests: jtreg runtime/Safepoint and runtime/RedefineTests.
>> To make sure the desired functionality was restored, the change was
>> manually tested by crashing the vm during VM_RedefineClasses::doit()
>> when we know that some locks are owned, and inspecting the hs_err file.
>> This is difficult to write a test for, so it was only done manually.
>>
>> Thanks,
>> Max