[PATCH] D80805: [KernelAddressSanitizer] Make globals constructors compatible with kernel

[Marco Elver via Phabricator via llvm-commits]

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This makes -fsanitize=kernel-address emit the correct globals
constructors for the kernel. We had to do the following:

- Disable generation of constructors that rely on linker features such as dead-global elimination.

- Only emit constructors for globals *not* in explicit sections. The kernel uses sections for special globals, which we should not touch.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203493

Tested:

  With test_kasan.ko, we can see the line
  
  	BUG: KASAN: global-out-of-bounds in kasan_global_oob+0xb3/0xba [test_kasan]


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80805

Files:
  llvm/include/llvm/Transforms/Utils/ModuleUtils.h
  llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
  llvm/lib/Transforms/Utils/ModuleUtils.cpp

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