RFR (S): 8073154: NULL-pointer dereferencing in LIR_OpProfileType::print_instr

[Filipp Zhinkin]

Hi all,

please review a small fix for 8073154.

LIR_OpProfileType's exact_klass is either a valid ciKlass when we know
it statically,
or a NULL when we don't.

Unfortunately, LIR_OpProfileType::print_instr is dereferencing it
without a NULL-check.

I've decided to print "unknown" exact klass's value in case of NULL to
be consistent
with ciTypeEntries::print_ciklass. Missed whitespaces were also added.

Bug id: https://bugs.openjdk.java.net/browse/JDK-8073154
Webrev: http://cr.openjdk.java.net/~fzhinkin/8073154/webrev.00/
Testing: executed a test on my linux-x86_64 laptop.

Thanks,
Filipp.