cmd/compile: possible PGO miscompilation in biogo-igor benchmark

[mknyszek]

The biogo-igor benchmark part of Sweet has been failing regularly at tip in the end-to-end test. It specifically fails when being run under PGO.

Broken out from #56958.

[mknyszek]

CC @golang/compiler

[mknyszek]

Example failure looks like:

error: piling: record on line 0; parse error on line 1, column 3: strconv.ParseInt: parsing "16243440": value out of range

2024-09-20 15:27 x_benchmarks-gotip-linux-amd64-longtest benchmarks@b8e725b7 go@c208b913 x/benchmarks/sweet/cmd/sweet.TestSweetEndToEnd (log)

[gopherbot]

Change https://go.dev/cl/615416 mentions this issue: sweet: remove biogo benchmarks from default set