RFR: 8339168: Optimize ClassFile Util slotSize

[Chen Liang]

On Wed, 28 Aug 2024 13:12:35 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> A small optimization to improve the performance of jdk.internal.classfile.impl.Util#slotSize/isDoubleSlot

@cl4es Observed that `slotSize` will only get a `CD_void` at method return type; so we can make the non-return-type (so field type and method parameter type) usages of `slotSize` to `isDoubleSlot() ? 2 : 1`.

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PR Comment: https://git.openjdk.org/jdk/pull/20747#issuecomment-2320023615