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https://bugs.gentoo.org/901099 and partly https://bugs.gentoo.org/900937.
Newer compilers may optimise such that < 7 registers are free on 32-bit x86
and then we get an "invalid asm" error. This is https://bugs.gentoo.org/901099
and https://trac.ffmpeg.org/ticket/8903.
Making matters worse, GCC sometimes hangs on invalid asm, so this also
mitigates a hang with e.g. -O3 -march=znver1. See https://bugs.gentoo.org/900937
and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109137.
In future, we may want to adjust the definition of HAVE_7REGS to just exclude
32-bit x86, but that's a big sledgehammer, so let's avoid it for now until we have
a reply on the upstream ffmpeg bug.
--- a/libavcodec/x86/cabac.h
+++ b/libavcodec/x86/cabac.h
@@ -175,7 +175,7 @@
#endif /* BROKEN_RELOCATIONS */
-#if HAVE_7REGS && !BROKEN_COMPILER
+#if HAVE_7REGS && !BROKEN_COMPILER && !ARCH_X86_32
#define get_cabac_inline get_cabac_inline_x86
static
#if defined(_WIN32) && !defined(_WIN64) && defined(__clang__)
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