RFR: 8285868: x86 intrinsics for floating point methods isNaN, isFinite and isInfinite [v10]

[Srinivas Vamsi Parasa]

> We develop optimized x86 intrinsics for the floating point class check methods `isNaN()`, `isFinite()` and `IsInfinite()` for Float and Double classes. JMH benchmarks show upto `~70% `improvement using` vfpclasss(s/d)` instructions.
> 
> 
> Benchmark (ns/op)	        Baseline Intrinsic(vfpclasss/d)	Speedup(%)
> FloatClassCheck.testIsFinite	0.562	          0.406	         28%
> FloatClassCheck.testIsInfinite	0.815	          0.383	         53%
> FloatClassCheck.testIsNaN	0.63	          0.382	         39%
> DoubleClassCheck.testIsFinite	0.565	          0.409	         28%
> DoubleClassCheck.testIsInfinite	0.812	          0.375	         54%
> DoubleClassCheck.testIsNaN	0.631	          0.38	         40%
> FPComparison.isFiniteDouble	332.638	          272.577	 18%
> FPComparison.isFiniteFloat	413.217	          331.825	 20%
> FPComparison.isInfiniteDouble	874.897	          240.632	 72%
> FPComparison.isInfiniteFloat	872.279	          321.269	 63%
> FPComparison.isNanDouble	286.566	          240.36	 16%
> FPComparison.isNanFloat	        346.123	          316.923	  8%

Srinivas Vamsi Parasa has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 13 commits:

 - update vmstructs
 - Merge branch 'master' of https://git.openjdk.java.net/jdk into float
 - Remove support for non vfpclasss/d based intrinsics
 - Merge branch 'master' of https://git.openjdk.java.net/jdk into float
 - add comment for vfpclasss/d for isFinite()
 - Merge branch 'master' of https://git.openjdk.java.net/jdk into float
 - zero out the upper bits not written by setb
 - use 0x1 to be simpler
 - remove the redundant temp register
 - Split the macros using predicate
 - ... and 3 more: https://git.openjdk.java.net/jdk/compare/9b7e42c0...dca4ec4c

-------------

Changes: https://git.openjdk.java.net/jdk/pull/8459/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8459&range=09
  Stats: 668 lines in 19 files changed: 666 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8459.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8459/head:pull/8459

PR: https://git.openjdk.java.net/jdk/pull/8459