push to stable

Final push for release

This had caused an assert SIGABRT with LibreOffice (see
<https://git.libreoffice.org/core/+/
e2c9ac71cec0f205b1d4864538e8158c22558296%5E%21> "ofz#30767 Build-Failure") at

> AFLplusplus#3  0x00007ffff7a07026 in __GI___assert_fail (assertion=0x7ffff79c3b98 "isString() && \"Not a string\"", file=0x7ffff79c3800 "~/llvm/inst/include/llvm/IR/Constants.h", line=661, function=0x7ffff79c3bb5 "llvm::StringRef llvm::ConstantDataSequential::getAsString() const") at /usr/src/debug/glibc-2.32-37-g760e1d2878/assert/assert.c:101
> AFLplusplus#4  0x00007ffff79b9dd1 in llvm::ConstantDataSequential::getAsString (this=0xcb75f90) at ~/llvm/inst/include/llvm/IR/Constants.h:661
> AFLplusplus#5  0x00007ffff79b8645 in (anonymous namespace)::AFLdict2filePass::runOnModule (this=0xd175d50, M=...) at ~/AFLplusplus/instrumentation/afl-llvm-dict2file.so.cc:406
> AFLplusplus#6  0x000000000550fb63 in (anonymous namespace)::MPPassManager::runOnModule (M=..., this=<optimized out>) at ~/llvm/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1550
> AFLplusplus#7  llvm::legacy::PassManagerImpl::run (this=0x9925a90, M=...) at ~/llvm/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:541
> AFLplusplus#8  0x000000000550feb9 in llvm::legacy::PassManager::run (this=this@entry=0x7fffffff91c0, M=...) at ~/llvm/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1677
> AFLplusplus#9  0x000000000653efb3 in (anonymous namespace)::EmitAssemblyHelper::EmitAssembly (this=this@entry=0x7fffffff9670, Action=Action@entry=clang::Backend_EmitObj, OS=std::unique_ptr<llvm::raw_pwrite_stream> = {...}) at ~/llvm/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1015
> AFLplusplus#10 0x0000000006540856 in clang::EmitBackendOutput (Diags=..., HeaderOpts=..., CGOpts=..., TOpts=..., LOpts=..., TDesc=..., M=0x944b6f0, Action=<optimized out>, OS=...) at /usr/include/c++/10/bits/move.h:76
> AFLplusplus#11 0x000000000689383c in clang::BackendConsumer::HandleTranslationUnit (this=0x944a210, C=...) at ~/llvm/llvm-project/clang/include/clang/Basic/TargetInfo.h:1076
> AFLplusplus#12 0x00000000078fe1c9 in clang::ParseAST (S=..., PrintStats=<optimized out>, SkipFunctionBodies=<optimized out>) at ~/llvm/llvm-project/clang/lib/Parse/ParseAST.cpp:171
> AFLplusplus#13 0x00000000067b9729 in clang::FrontendAction::Execute (this=this@entry=0x941b1a0) at ~/llvm/llvm-project/clang/lib/Frontend/FrontendAction.cpp:949
> AFLplusplus#14 0x00000000066f6586 in clang::CompilerInstance::ExecuteAction (this=this@entry=0x940f390, Act=...) at ~/llvm/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:949
> AFLplusplus#15 0x000000000686ecfb in clang::ExecuteCompilerInvocation (Clang=Clang@entry=0x940f390) at ~/llvm/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:278
> AFLplusplus#16 0x00000000039f6f04 in cc1_main (Argv=..., Argv0=0x7fffffffcc0c "~/llvm/inst/bin/clang-13", MainAddr=MainAddr@entry=0x39f0a60 <GetExecutablePath[abi:cxx11](char const*, bool)>) at ~/llvm/llvm-project/clang/tools/driver/cc1_main.cpp:246
> AFLplusplus#17 0x00000000039f054d in ExecuteCC1Tool (ArgV=...) at ~/llvm/llvm-project/clang/tools/driver/driver.cpp:330
> AFLplusplus#18 0x00000000039f25c5 in main (argc_=<optimized out>, argc_@entry=145, argv_=<optimized out>, argv_@entry=0x7fffffffc3d8) at ~/llvm/llvm-project/clang/tools/driver/driver.cpp:407

when (in frame AFLplusplus#5) FuncName is
"_ZNKSt17basic_string_viewIDsSt11char_traitsIDsEE4findEPKDsm" (i.e.,

> std::basic_string_view<char16_t, std::char_traits<char16_t> >::find(char16_t const*, unsigned long) const

) and thus isStdString is true.