RFR: 8373046: Method::get_c2i_unverified_entry() and get_c2i_no_clinit_check_entry() are missing check for abstract method

[Vladimir Kozlov]

On Wed, 3 Dec 2025 19:45:12 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

> This PR fixes a bug introduced by [JDK-8365501](https://bugs.openjdk.org/browse/JDK-8365501). It restores the behavior of `Method::get_c2i_unverified_entry` or `Method::get_c2i_no_clinit_check_entry` for abstract methods as it was before JDK-8365501. It was never the intention of JDK-8365501 to change the behavior.
> I am not sure if there is any possible code flow that can result in calling `Method::get_c2i_unverified_entry` or `Method::get_c2i_no_clinit_check_entry` for abstract methods, but I think it is safe to keep the behavior of these functions as before.

src/hotspot/share/oops/method.cpp line 180:

> 178: address Method::get_c2i_no_clinit_check_entry() {
> 179:   if (is_abstract()) {
> 180:     return nullptr;

Why it is `nullptr` instead of `SharedRuntime::get_handle_wrong_method_abstract_stub()`. Add comment.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28645#discussion_r2586449811