RFR(M): 8171244: PPC64: Make interpreter's math entries consistent with C1 and C2 and support FMA

[Doerr, Martin]

Hi,

as discussed in [1], floating point computations should produce consistent results regardless of whether the Java code gets interpreted or is compiled by any JIT-compiler.
In addition, JDK9 introduced new floating point multiply-accumulate intrinsics which are currently missing on PPC64.

Webrev is here:
http://cr.openjdk.java.net/~mdoerr/8171244_PPC64_fma/webrev.00/

Note: The current version of the change removes the function "math_entry_available" from shared code which was only used by PPC.
I can either leave it there or ask somebody from Oracle to sponsor.

Please review.

Best regards,
Martin


[1] http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-December/025073.html

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