RFR: 8275167: x86 intrinsic for unsignedMultiplyHigh

[Vamsi Parasa]

Optimize the new Math.unsignedMultiplyHigh using the x86 mul instruction. This change show 1.87X improvement on a micro benchmark.

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Commit messages:
 - fix typo in function name
 - 8275167: x86 intrinsic for unsignedMultiplyHigh

Changes: https://git.openjdk.java.net/jdk/pull/5933/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5933&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275167
  Stats: 59 lines in 11 files changed: 59 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5933.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5933/head:pull/5933

PR: https://git.openjdk.java.net/jdk/pull/5933