rustc SIGILL since qsort_r patches

["Cristian Rodríguez" <cristian@rodriguez.im>]

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Hi:

After quite some head scratching I found the recent qsort_r patches
triggers a bug "somewhere" that makes rustc LTO end in sigkill (ud2)

happens compiling anything in release mode with any toolchain (stable,
beta, nightly)

#0  0x000015129e40516a in int
llvm::array_pod_sort_comparator<llvm::BranchFolder::MergePotentialsElt>(void
const*, void const*) () from
/home/crrodriguez/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/
libLLVM-17-rust-1.75.0-nightly.so

#1  0x00001512a0043779 in __GI___qsort_r (pbase=0x15128c90bd80,
total_elems=<optimized out>, size=0x10, cmp=<optimized out>, arg=<optimized
out>) at qsort.c:335

#2  0x000015129e4df6e6 in
llvm::BranchFolder::TryTailMergeBlocks(llvm::MachineBasicBlock*,
llvm::MachineBasicBlock*, unsigned int) () from
/home/crrodriguez/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/
libLLVM-17-rust-1.75.0-nightly.so

git head == bad
2.38   == good

Main interest is to know if I am not alone and if anyone else has observed
this problem so far.
Thanks..