RFR: 8350115: [leyden] Clean up name_and_sig_as_C_string uses

[Aleksey Shipilev]

On Fri, 14 Feb 2025 16:26:05 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Now that we have optimized a lot of unnecessary compilations, profiles show that various `name_and_sig_as_C_string` are taking about 1.2% in Leyden benchmark profiles. We should sweep those up into conditional log statements and/or common the paths where we actually need these names outside of logging. 
> 
> After this fix, the profile impact of `name_and_sig_as_C_string` is `<0.05%`.
> 
> Performance impact on benchmarks is currently hidden by benchmark noise.

Thanks! I think this is good to go.

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PR Comment: https://git.openjdk.org/leyden/pull/43#issuecomment-2659928666