Revert "Reapply [hwasan] Update dbg.assign intrinsics in HWAsan pass … (#79186)

…#78606"

This reverts commit 13c6f1ea because it
causes an assertion in DebugInfoMetadata.cpp:1968 in Clang Linux
builders for Fuchsia.

https://logs.chromium.org/logs/fuchsia/buildbucket/cr-buildbucket/8758111613576762817/+/u/clang/build/stdout