8365146: Remove LockingMode related code from ppc64

[fbredber]

Since the integration of JDK-8359437 the LockingMode flag can no longer be set by the user, instead it's declared as const int LockingMode = LM_LIGHTWEIGHT;. This means that we can now safely remove all LockingMode related code from all platforms.

This PR removes LockingMode related code from the ppc64le platform.

When all the LockingMode code has been removed from all platforms, we can go on and remove it from shared (non-platform specific) files as well. And finally remove the LockingMode variable itself.

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Progress

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Issue

• JDK-8365146: Remove LockingMode related code from ppc64 (Sub-task - P4)

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[bridgekeeper]

👋 Welcome back fbredberg! 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]

❗ This change is not yet ready to be integrated.
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[openjdk]

@fbredber The following label will be automatically applied to this pull request:

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[fbredber]

/label remove hotspot
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[openjdk]

@fbredber
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[openjdk]

@fbredber
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[fbredber]

@TheRealMDoerr (or @reinrich)
I've run rudimentary tests using QEMU, but it would be nice if you could take it for a spin on real hardware.

[mlbridge]

Webrevs

• 00: Full (e909d06d)