RFR: 8277180: Intrinsify recursive ObjectMonitor locking for C2 x64 and A64 [v2]

[Andrew Haley]

On Wed, 17 Nov 2021 10:40:35 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> The increment macro doesn't seem to utilize the fact that 1u can be encoded as an immediate to the add instruction. 

Sure it does. Try it. If it doesn't, we'll change `increment()`! ��

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PR: https://git.openjdk.java.net/jdk/pull/6406