cmd/compile: pass arguments to convt2E/I integer functions by value
The motivation is avoid generating a pointer to the data being converted so it can be garbage collected. The change also slightly reduces binary size by shrinking call sites. Fixes #24286 Benchmark results: name old time/op new time/op delta ConvT2ESmall-4 2.86ns ± 0% 2.80ns ± 1% -2.12% (p=0.000 n=29+28) ConvT2EUintptr-4 2.88ns ± 1% 2.88ns ± 0% -0.20% (p=0.002 n=28+30) ConvT2ELarge-4 19.6ns ± 0% 20.4ns ± 1% +4.22% (p=0.000 n=19+30) ConvT2ISmall-4 3.01ns ± 0% 2.85ns ± 0% -5.32% (p=0.000 n=24+28) ConvT2IUintptr-4 3.00ns ± 1% 2.87ns ± 0% -4.44% (p=0.000 n=29+25) ConvT2ILarge-4 20.4ns ± 1% 21.3ns ± 1% +4.41% (p=0.000 n=30+26) ConvT2Ezero/zero/16-4 2.84ns ± 1% 2.99ns ± 0% +5.38% (p=0.000 n=30+25) ConvT2Ezero/zero/32-4 2.83ns ± 2% 3.00ns ± 0% +5.91% (p=0.004 n=27+3) Change-Id: I65016ec94c53f97c52113121cab582d0c342b7a8 Reviewed-on: https://go-review.googlesource.com/102636Reviewed-by:Josh Bleecher Snyder <josharian@gmail.com> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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