RFR: 8341512: Optimize StackMapGenerator::processInvokeInstructions

[Chen Liang]

On Fri, 4 Oct 2024 02:15:51 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> A small optimization for StackMapGenerator::processInvokeInstructions.
> 
> 1. Use local currentFrame to avoid multiple getfields
> 2. remove Util.methodTypeSymbol(NameAndTypeEntry)
> 3. Use decStack instead of popStack to reduce array access in popStack
> 4. codeSize reduced from 277 to 262

👍 `equalsString` allows for laziness when we receive a lazy name and type from a class reader.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21344#pullrequestreview-2346987217