RFR(XS): 8098517: Unprotected PrintMalloc in os::realloc

[Kim Barrett]

Please review this small cleanup of PrintMalloc usage.

Most tests of PrintMalloc also verify tty != NULL before printing. The
only exception is os::realloc. This change makes os::realloc
consistent with other uses.  While we were there, also fixed the typo
in the associated message, e.g.  "remalloc" => "realloc".

CR:
https://bugs.openjdk.java.net/browse/JDK-8098517

Webrev:
http://cr.openjdk.java.net/~kbarrett/8098517/webrev/

Testing:
JPRT hotspot testlist, vm.quick testlist