8381531: [lworld] Startup performance regression with Valhalla caused by Method::link_method

[matias9927]

The method Method::link_method() has a notable impact on overhead and results in notable performance regressions from mainline. The source of this performance difference seems to be the aggressive calculation and recalculation of signature calling conventions for methods. This patch introduces the possibility for methods to inherit adapters from super methods so long as its calling conventions are compatible with the calling conventions introduced by local interfaces.

This design reports a x-y% improvment.

Verified with tier 1-5 tests.

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Issue

• JDK-8381531: [lworld] Startup performance regression with Valhalla caused by Method::link_method (Bug - P3)

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$ git fetch https://git.openjdk.org/valhalla.git pull/2357/head:pull/2357
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Update a local copy of the PR:
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[DanHeidinga]

Can we wrap this in a if (!method->is_static()) {...} block?