8383809: [type-classes] Prototype UInt128

[rgiulietti]

Prototype a fully functional unsigned int128 type as a Valhalla value class.

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Progress

• Change must not contain extraneous whitespace

Issue

• JDK-8383809: [type-classes] Prototype UInt128 (Enhancement - P4)

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[openjdk]

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8383809: [type-classes] Prototype UInt128

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[mlbridge]

Webrevs

• 00: Full (406f30e9)

[rgiulietti]

Subject to change and discussion:

• Use of factory methods rather than constructors.
• Adding/changing/removing functionality (e.g., adding rotateLeft()).
• Adding more general *Exact() methods that throw on overflow.
• Use of typeclass mechanisms.