r224351 causing crashes while building ICU

[Reid Kleckner]

Here is a single function .ll file that reproduces the crash in
CodeGenPrep. It's extracted from ICU. It still needs to be reduced,
probably with bugpoint.

On Tue, Dec 16, 2014 at 4:28 PM, Reid Kleckner <rnk at google.com> wrote:
>
> I plan to revert it, as the mailing lists are down and it's hard to
> discover these kinds of failures without them.
>
> I'll try to get you a reproducer. There's a bad cast with this stack trace:
>
> clang: third_party/llvm/llvm/include/llvm/Support/Casting.h:237: typename cast_retty<X, Y *>::ret_type llvm::cast(Y *) [X = llvm::Instruction, Y = llvm::Value]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
>
> Program received signal SIGABRT, Aborted.
> 0x00007ffff732d6db in raise () from /usr/grte/v4/lib64/libc.so.6
> (gdb) bt
> #0  0x00007ffff732d6db in raise () from /usr/grte/v4/lib64/libc.so.6
> #1  0x00007ffff732f3ef in abort () from /usr/grte/v4/lib64/libc.so.6
> #2  0x00007ffff73262a9 in __assert_fail_base () from /usr/grte/v4/lib64/libc.so.6
> #3  0x00007ffff7326353 in __assert_fail () from /usr/grte/v4/lib64/libc.so.6
> #4  0x000000000059ce69 in llvm::cast_retty<llvm::Instruction, llvm::Value*>::ret_type llvm::cast<llvm::Instruction, llvm::Value>(llvm::Value*) ()
> #5  0x0000000002ea8346 in (anonymous namespace)::TypePromotionHelper::promoteOperandForOther(llvm::Instruction*, (anonymous namespace)::TypePromotionTransaction&, llvm::DenseMap<llvm::Instruction*, (anonymous namespace)::TypeIsSExt, llvm::DenseMapInfo<llvm::Instruction*>, llvm::detail::DenseMapPair<llvm::Instruction*, (anonymous namespace)::TypeIsSExt> >&, unsigned int&, llvm::SmallVectorImpl<llvm::Instruction*>*, llvm::SmallVectorImpl<llvm::Instruction*>*, bool) ()
> #6  0x0000000002ea7c89 in (anonymous namespace)::TypePromotionHelper::zeroExtendOperandForOther(llvm::Instruction*, (anonymous namespace)::TypePromotionTransaction&, llvm::DenseMap<llvm::Instruction*, (anonymous namespace)::TypeIsSExt, llvm::DenseMapInfo<llvm::Instruction*>, llvm::detail::DenseMapPair<llvm::Instruction*, (anonymous namespace)::TypeIsSExt> >&, unsigned int&, llvm::SmallVectorImpl<llvm::Instruction*>*, llvm::SmallVectorImpl<llvm::Instruction*>*) ()
> #7  0x0000000002eaf016 in (anonymous namespace)::CodeGenPrepare::ExtLdPromotion((anonymous namespace)::TypePromotionTransaction&, llvm::LoadInst*&, llvm::Instruction*&, llvm::SmallVectorImpl<llvm::Instruction*> const&, unsigned int) ()
> #8  0x0000000002e9f163 in (anonymous namespace)::CodeGenPrepare::MoveExtToFormExtLoad(llvm::Instruction*&) ()
> #9  0x0000000002e9def3 in (anonymous namespace)::CodeGenPrepare::OptimizeInst(llvm::Instruction*) ()
> #10 0x0000000002e9d9f6 in (anonymous namespace)::CodeGenPrepare::OptimizeBlock(llvm::BasicBlock&) ()
> #11 0x0000000002e9bdb7 in (anonymous namespace)::CodeGenPrepare::runOnFunction(llvm::Function&) ()
> #12 0x0000000003896a0d in llvm::FPPassManager::runOnFunction(llvm::Function&) ()
> #13 0x0000000003896d18 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
> #14 0x00000000038973d9 in (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) ()
> #15 0x0000000003896fce in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
> #16 0x0000000003897881 in llvm::legacy::PassManager::run(llvm::Module&) ()
> #17 0x000000000045af33 in (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, llvm::raw_ostream*) ()
> #18 0x000000000045a862 in clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) ()
> #19 0x0000000000436bb3 in clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) ()
> #20 0x000000000170635b in clang::ParseAST(clang::Sema&, bool, bool) ()
> #21 0x00000000013bcc29 in clang::ASTFrontendAction::ExecuteAction() ()
> #22 0x00000000004347a1 in clang::CodeGenAction::ExecuteAction() ()
> #23 0x00000000013bc710 in clang::FrontendAction::Execute() ()
> #24 0x000000000126fc1b in clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
> #25 0x000000000042f4a8 in clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
> #26 0x0000000000416c67 in cc1_main(llvm::ArrayRef<char const*>, char const*, void*) ()
> #27 0x0000000000426f93 in ExecuteCC1Tool(llvm::ArrayRef<char const*>, llvm::StringRef) ()
>
>
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