RFR (S) 8150669: C1 intrinsic for Class.isPrimitive

[Aleksey Shipilev]

Hi,

I would like to amend C1 with handling Class.isPrimitive intrinsic:
  http://cr.openjdk.java.net/~shade/8150669/webrev.01/
  https://bugs.openjdk.java.net/browse/JDK-8150669

Through a long chain of dependencies, it would benefit String
concatenation, possibly startup (lots of usages in java.lang.invoke, and
who knows how many other places in JDK that use reflective meddling),
and also, for a fun of it, fastdebug builds.

Performance data shows we improve all interesting cases:
  http://cr.openjdk.java.net/~shade/8150669/notes.txt

Testing: new test; targeted benchmarks; JPRT -testset hotspot

Thanks,
-Aleksey

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