[llvm] [SandboxVectorizer] Define SeedBundle: a set of instructions to be vectorized [retry] (PR #111073)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clangd-ubuntu-tsan` running on `clangd-ubuntu-clang` while building `llvm` at step 5 "build-clangd-clangd-index-server-clangd-indexer".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/134/builds/6581

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-clangd-clangd-index-server-clangd-indexer) failure: build (failure)
...
28.361 [2744/18/1850] Building CXX object lib/Target/CMakeFiles/LLVMTarget.dir/TargetMachineC.cpp.o
28.368 [2743/18/1851] Building CXX object lib/Target/CMakeFiles/LLVMTarget.dir/Target.cpp.o
28.539 [2742/18/1852] Building AArch64GenDAGISel.inc...
29.426 [2741/18/1853] Building LoongArchGenSubtargetInfo.inc...
30.106 [2740/18/1854] Building AArch64GenRegisterBank.inc...
30.224 [2739/18/1855] Building AArch64GenRegisterInfo.inc...
30.390 [2738/18/1856] Building AArch64GenPreLegalizeGICombiner.inc...
30.488 [2737/18/1857] Building R600GenDFAPacketizer.inc...
30.542 [2736/18/1858] Building AArch64GenPostLegalizeGILowering.inc...
32.746 [2735/18/1859] Building CXX object lib/Transforms/Vectorize/CMakeFiles/LLVMVectorize.dir/SandboxVectorizer/SeedCollector.cpp.o
FAILED: lib/Transforms/Vectorize/CMakeFiles/LLVMVectorize.dir/SandboxVectorizer/SeedCollector.cpp.o 
ccache /usr/bin/clang++ -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/lib/Transforms/Vectorize -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Transforms/Vectorize -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/include -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fno-omit-frame-pointer -gline-tables-only -fsanitize=thread -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT lib/Transforms/Vectorize/CMakeFiles/LLVMVectorize.dir/SandboxVectorizer/SeedCollector.cpp.o -MF lib/Transforms/Vectorize/CMakeFiles/LLVMVectorize.dir/SandboxVectorizer/SeedCollector.cpp.o.d -o lib/Transforms/Vectorize/CMakeFiles/LLVMVectorize.dir/SandboxVectorizer/SeedCollector.cpp.o -c /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Transforms/Vectorize/SandboxVectorizer/SeedCollector.cpp
/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Transforms/Vectorize/SandboxVectorizer/SeedCollector.cpp:18:10: fatal error: 'span' file not found
   18 | #include <span>
      |          ^~~~~~
1 error generated.
33.364 [2735/17/1860] Building CXX object lib/Object/CMakeFiles/LLVMObject.dir/IRSymtab.cpp.o
37.901 [2735/16/1861] Building AArch64GenInstrInfo.inc...
38.867 [2735/15/1862] Building CXX object lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/AsmParser.cpp.o
39.054 [2735/14/1863] Building AArch64GenSubtargetInfo.inc...
44.873 [2735/13/1864] Building AMDGPUGenMCPseudoLowering.inc...
46.096 [2735/12/1865] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/AsmPrinter.cpp.o
46.759 [2735/11/1866] Building AMDGPUGenCallingConv.inc...
48.684 [2735/10/1867] Building AMDGPUGenRegBankGICombiner.inc...
49.413 [2735/9/1868] Building AMDGPUGenPostLegalizeGICombiner.inc...
50.007 [2735/8/1869] Building AMDGPUGenDisassemblerTables.inc...
50.077 [2735/7/1870] Building AMDGPUGenPreLegalizeGICombiner.inc...
50.174 [2735/6/1871] Building AMDGPUGenMCCodeEmitter.inc...
52.819 [2735/5/1872] Building AMDGPUGenAsmWriter.inc...
54.797 [2735/4/1873] Building AMDGPUGenAsmMatcher.inc...
57.935 [2735/3/1874] Building AMDGPUGenGlobalISel.inc...
58.301 [2735/2/1875] Building AMDGPUGenDAGISel.inc...
59.833 [2735/1/1876] Building AMDGPUGenInstrInfo.inc...
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/111073