RFR 8199603: Build failures after JDK-8199421 "Add support for vector popcount"

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8199603

Fix:
  http://cr.openjdk.java.net/~shade/8199603/webrev.01/

The problem with the offending change was that the declaration for vpopcntd comes in shared 32/64
assembler, but definition is in 64 assembler only. Assembler method is being used from shared 32/64
x86.ad, so the simplest fix is moving the definition close to shared 32/64, near existing popcntl.

Testing: x86_32 build, x86_64 compiler/vectorization/TestPopCountVector test
(can run it through submit-hs, but I think it is too trivial to bother)

Thanks,
-Aleksey

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