BytecodeLift implementation progress + SlotOp

[asotona]

In this patch:

• lifting of shifts, instanceof, stack ops
• fixes of types resolution and conversions in generator
• enabled stack for conditional branches
• fixed lift to survive additional labels in the code
• implemented LocalsTypeMapper to support SlotOp for lift
• implemented SlotOp and SlotSSA for lift

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Progress

• [x] Change must not contain extraneous whitespace

Contributors

• Paul Sandoz <[email protected]>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/babylon.git pull/80/head:pull/80
$ git checkout pull/80

Update a local copy of the PR:
$ git checkout pull/80
$ git pull https://git.openjdk.org/babylon.git pull/80/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 80

View PR using the GUI difftool:
$ git pr show -t 80

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/babylon/pull/80.diff

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