[clang] [llvm] [ASAN] For Asan instrumented global, emit two symbols, one with actual size and other with instrumented size. (PR #70166)

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skc7 wrote:

@hctim @MaskRay @vitalybuka #70166 and #68865 have been pending for review and approvals for few months now. All the feedback has been useful in improving the patch. Made the changes to patches as per feedback.
Please review.

https://github.com/llvm/llvm-project/pull/70166