[clang] [llvm] [SPARC] Align i128 to 16 bytes in SPARC datalayouts (PR #106951)

[Rainer Orth via cfe-commits]

rorth wrote:

In a local `sparcv9-sun-solaris2.11` build, I get (with `-silence-passes` removed)
```
> /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/bin/bugpoint -load /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/lib/BugpointPasses.so /vol/llvm/src/llvm-project/dist/llvm/test/BugPoint/remove_arguments_test.ll -output-prefix /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/test/BugPoint/Output/remove_arguments_test.ll.tmp -bugpoint-crashcalls 
Read input file      : '/vol/llvm/src/llvm-project/dist/llvm/test/BugPoint/remove_arguments_test.ll'
*** All input ok
Running selected passes on program to test for crash: Assertion failed: Pos != size_t(-1) && "no i64 data layout found!", file /vol/llvm/src/llvm-project/dist/llvm/lib/IR/AutoUpgrade.cpp, line 5526
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/bin/opt -bugpoint-enable-legacy-pm -disable-symbolication -o /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/test/BugPoint/Output/remove_arguments_test.ll.tmp-output-919fb11.bc -load /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/lib/BugpointPasses.so -bugpoint-crashcalls /var/llvm/dist-sparcv9-release-stage2-A-flang-clang19/tools/clang/stage2-bins/test/BugPoint/Output/remove_arguments_test.ll.tmp-input-7ed07c3.bc
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  opt       0x0000000107d31e74 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 36
1  opt       0x0000000107d32778 SignalHandler(int) + 896
2  libc.so.1 0x00007fffff0c6398 __sighndlr + 12
3  libc.so.1 0x00007fffff0b8c40 call_user_handler + 1024
4  libc.so.1 0x00007fffff0b9030 sigacthandler + 208
5  libc.so.1 0x00007fffff0cb4b0 __lwp_sigqueue + 8
6  libc.so.1 0x00007ffffefe519c abort + 252
7  libc.so.1 0x00007ffffefe5fd0 _assert + 96
8  opt       0x0000000107974b8c llvm::UpgradeDataLayoutString[abi:cxx11](llvm::StringRef, llvm::StringRef) + 4176
9  opt       0x00000001078c3ba4 (anonymous namespace)::BitcodeReader::parseModule(unsigned long, bool, llvm::ParserCallbacks)::$_0::operator()() const + 96
10 opt       0x00000001078bc3c8 (anonymous namespace)::BitcodeReader::parseModule(unsigned long, bool, llvm::ParserCallbacks) + 3804
11 opt       0x0000000107898b8c llvm::BitcodeModule::getModuleImpl(llvm::LLVMContext&, bool, bool, bool, llvm::ParserCallbacks) + 3592
12 opt       0x000000010789df6c llvm::BitcodeModule::parseModule(llvm::LLVMContext&, llvm::ParserCallbacks) + 296
13 opt       0x000000010789e184 llvm::parseBitcodeFile(llvm::MemoryBufferRef, llvm::LLVMContext&, llvm::ParserCallbacks) + 388
14 opt       0x0000000107710934 llvm::parseIR(llvm::MemoryBufferRef, llvm::SMDiagnostic&, llvm::LLVMContext&, llvm::ParserCallbacks) + 588
15 opt       0x0000000107711184 llvm::parseIRFile(llvm::StringRef, llvm::SMDiagnostic&, llvm::LLVMContext&, llvm::ParserCallbacks) + 540
16 opt       0x0000000103647560 optMain + 3140
17 opt       0x0000000103645f24 _start + 100
Crashed: Abort
Dumped core
```
and several more instances of that.

I wonder how this patch has ever been tested natively...

https://github.com/llvm/llvm-project/pull/106951