8354871: Replace stack map frame type magics with constants

[fandreuz]

In this PR I introduce some constants in StackMapGenerator. No change in logic is expected.

Passes tests in jdk/classfile.

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Progress

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Issue

• JDK-8354871: Replace stack map frame type magics with constants (Enhancement - P4)

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[bridgekeeper]

👋 Welcome back fandreuz! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (0ca1e717)

[fandreuz]

Hi @liach, could you have a look at this PR since you opened the ticket?