[11u] RFR: 8265417: Backport of JDK-8249672 breaks Solaris x86 build

[Thomas Stüfe]

Hi,

may I have reviews for this 11u-only build fix please?

https://bugs.openjdk.java.net/browse/JDK-8253115 had been downported
without testing Solaris x86, which broke.

The fix is trivial and just adds a stubbed-out variant of the missing
microcode printing function. It's only used for error reporting, so
stubbing it out is fine here. Solaris enthusiasts can add a follow-up patch
later to flesh this function out.

http://cr.openjdk.java.net/~stuefe/webrevs/backports/8265417-solaris-x86-missing-microcode-function-breaks-build

Thanks to Steffen for reporting this:

https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2021-April/046107.html

Cheers, Thomas