Revert "[CodeGen] Port SafeStack to new pass manager (#73747)" (#73965)

This reverts commit a4d5fd4d.

The above commit breaks greendragon lldb bots:
Link to failing builds:
https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake/63300/
https://green.lab.llvm.org/green/view/LLDB/job/as-lldb-cmake/10345/

I found this PR to be the offending one after using git bisect with the
cmake invocation:

cmake -G Ninja ../llvm -DCMAKE_BUILD_TYPE=Release
-DCMAKE_EXPORT_COMPILE_COMMANDS=ON
'-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64'
-DLLVM_ENABLE_ASSERTIONS:BOOL=TRUE
-DLLVM_ENABLE_MODULES=On
-DLLVM_ENABLE_PROJECTS='clang;lld;lldb;cross-project-tests'
-DLLVM_VERSION_PATCH=99
'-DLLVM_ENABLE_RUNTIMES=libcxx;libcxxabi;compiler-rt'

and running
ninja lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/CodeGenPassBuilder.cpp.o