RFR: 8341510: Optimize StackMapGenerator::processFieldInstructions

[Chen Liang]

On Fri, 4 Oct 2024 02:47:12 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> A small optimization to reduce CodeSize, codeSize reduced from 164 to 140.
> 
> 1. Use local currentFrame to avoid multiple getfields
> 2. Use decStack instead of popStack to reduce array access in popStack
> 3. Call Util.fieldTypeSymbol to pass in type instead of nameAndType

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21345#pullrequestreview-2349290148