Bug#979495: clang_delta (creduce, cvise) segfaults when built with LLVM 11

[Matthias Klose]

Package: src:llvm-toolchain-11
Version: 1:11.0.1-1
Severity: serious
Tags: sid bullseye
Forwarded: https://bugs.llvm.org/show_bug.cgi?id=48682

First seen at https://gcc.gnu.org/PR98557, at least on armhf

$ cat > wxe_funcs.ii
static __typeof() a     __attribute__((__weakref__("pthread_mutex_destroy")))

$ /usr/lib/cvise/clang_delta --query-instances=replace-function-def-with-decl
wxe_funcs.ii
clang_delta: /usr/lib/llvm-11/include/llvm/ADT/PointerIntPair.h:178: static
intptr_t llvm::PointerIntPairInfo<PointerT, IntBits,
PtrTraits>::updatePointer(intptr_t, PointerT) [with PointerT = clang::Stmt*;
unsigned int IntBits = 1; PtrTraits = llvm::PointerLikeTypeTraits<clang::Stmt*>;
intptr_t = int]: Assertion `(PtrWord & ~PointerBitMask) == 0 && "Pointer is not
sufficiently aligned"' failed.
Aborted

Expected behavior:

$ /usr/lib/cvise/clang_delta --query-instances=replace-function-def-with-decl
wxe_funcs.ii
Available transformation instances: 0

Building the cvise and creduce packages with LLVM 9 or LLVM 10 doesn't show the
segfault.