JDK10/RFR(L): 8167199: Add C2 SPARC intrinsic for BigInteger::multiplyToLen() method.

[Patric Hedlin]

Dear all,

I would like to ask for help to review the following change/update:

Issue:   https://bugs.openjdk.java.net/browse/JDK-8167199

Webrev:  http://cr.openjdk.java.net/~phedlin/tr8167199/


8167199: Add C2 SPARC intrinsic for BigInteger::multiplyToLen() method.

     Added C2 SPARC support for intrinsic 'multiplyToLen', including
     generalised version based on 'mpmul' instruction (when available).
     The code emitted should be subject for evaluation (e.g. MME on
     SPARC Core C5 might be used in an improved version).

Testing:

     Mostly tested on JDK9 (jtreg/RBT/hotspot/tier0-comp).
     Testing on JDK10 (jtreg/RBT/hotspot/precheckin-comp).


Best regards,
Patric