8381997: Move markWord.hpp cleanups from the valhalla lworld branch

[stefank]

Valhalla adds new bits to the mark word and to support that we have tried to unify the structure of the comments and the constants to make it easier to get an overview of the mark word bits and how they are used.

I propose that we move over the restructuring part so that reviewing the Valhalla additions become easier.

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Issue

• JDK-8381997: Move markWord.hpp cleanups from the valhalla lworld branch (Enhancement - P4)

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[mlbridge]

Webrevs

• 01: Full - Incremental (d1de7331)
• 00: Full (1b08fbb9)

[Arraying]

Do you also intend to upstream the wrong lock_mask [1] in the x86 C2 macro assembler? In this PR or a potential follow-up.

[1] https://github.com/openjdk/valhalla/pull/2310/changes#r3051318602

[stefank]

Do you also intend to upstream the wrong lock_mask [1] in the x86 C2 macro assembler? In this PR or a potential follow-up.

[1] https://github.com/openjdk/valhalla/pull/2310/changes#r3051318602

My intention was to do so in a follow-up, but maybe I should just sneak it in here.