[Bug 215333] head -r310046 for powerpc family: sys/powerpc/powerpc/intr_machdep.c's i->trig == -1 if-tests reported as always false by compiler

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215333

--- Comment #1 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #0)

This is more likely a kernel source code issue than a toolchain issue as far as
I know: It is  not a claim that the compiler's report is wrong.

More likely the source code violates a C rule in a way that the compiler is
allowed any handling. That handling can change with optimization level and
at some optimization levels it might appears to be working even though the
language standard makes no such guarantees.

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