[lilliput-jdk17u:lilliput] RFR: 8310744: [Lilliput/JDK17] Revert C1_MacroAssembler::initialize_header removal of BiasedLocking path

Fri Jun 23 13:47:27 UTC 2023

On Fri, 23 Jun 2023 13:34:48 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> In x86 C1_MacroAssembler::initialize_header, we accidentally removed the BiasedLocking path that should reach the klass prototype header. This reshapes x86 code to aarch64 code shape, which does the right thing.
> 
> This is 17u-specific, as BiasedLocking is removed in later releases. 
> 
> Additional testing:
>  - [ ] Linux x86_64 fastdebug `tier1 tier2` (default)
>  - [ ] Linux x86_64 fastdebug `tier1 tier2` (+UCOH)

Looks good!

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Marked as reviewed by rkennke (Reviewer).

PR Review: https://git.openjdk.org/lilliput-jdk17u/pull/47#pullrequestreview-1495179687