RFR: 8316305: Initial buffer size of StackWalker is too small caused by JDK-8285447

[Brent Christian]

On Thu, 14 Sep 2023 17:06:53 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> A trivial fix.   [JDK-8285447](https://bugs.openjdk.org/browse/JDK-8285447) intends to change the initial batch size only for a stack walker with an estimated stack depth. For stack walkers without user-supplied estimated stack depth, the initial batch size is changed to 3 which is a bug.  This causes the stack walker to fetch the second batch after walking 2 frames.

Marked as reviewed by bchristi (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15749#pullrequestreview-1627775967