cmd/compile: new bounds check strategy pushes ppc64le unoptimized builds over nosplit stack limit

[prattmic]

ppc64le builds started failing with https://go.dev/cl/682498.

Example failure: https://ci.chromium.org/ui/p/golang/builders/ci/gotip-linux-ppc64le_power10/b8707359340590493345/overview

        runtime.sigprofNonGoWrapper: nosplit stack over 800 byte limit
        runtime.sigprofNonGoWrapper<63>
            grows 544 bytes, calls runtime.sigprofNonGo<1>
                grows 80 bytes, calls runtime.(*cpuProfile).addNonGo<1>
                    grows 56 bytes, calls runtime.panicBounds<1>
                        grows 136 bytes, calls runtime.panicBounds64<1>
                            grows 0 bytes, calls runtime.morestack<0>
                            16 bytes over limit

It looks like this only impacts -N -l builds, which is why so few tests fail.

cc @randall77 @golang/ppc64

[randall77]

Fix is at CL 693557

[gopherbot]

Change https://go.dev/cl/693557 mentions this issue: cmd/compile: make panicBounds stack frame smaller on ppc64

[gabyhelp]

Related Issues

• cmd/compile: compiler built with PGO crashes occasionally on ppc64{le} #60368 (closed)
• cmd/gc: runtime.cgocall nosplit stack overflow #9721 (closed)
• runtime: nosplit stack overflow when building tests with -N -l #14319 (closed)
• cmd/compile: ppc64le broken by encourage inlining of functions with single-call bodies #28679 (closed)

Related Code Changes

• cmd/compile: make panicBounds stack frame smaller on ppc64
• [dev.ssa] cmd/compile: shrink stack guard

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