RFR: 8333382: [s390x] Enhance popcnt Instruction to use Z15 facilities [v4]

[Amit Kumar]

On Mon, 10 Jun 2024 13:52:11 GMT, Andrew Haley <aph at openjdk.org> wrote:

>anywhere else must provide a register to use or have some sort of conditionals at the point pop_count_int is used.

So for machines `<=Z14` we will never go in the `if` block; And the moment we enter in `else` block there is check, which confirms `r_tmp` shouldn't be `noreg` which will force author to pass a temporary register. Isn't it ?

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PR Review Comment: https://git.openjdk.org/jdk/pull/19509#discussion_r1633330779