Revert "[Sanitizers] Fix read buffer overrun in scanning loader commands"

Revert "[Sanitizers] Fix read buffer overrun in scanning loader commands"

This reverts commit abbd4da2043856f443e3d1c8d2c7627cac93a6ac.

This change is breaking many bots including:
- http://45.33.8.238/linux/98629/step_10.txt
- https://buildkite.com/llvm-project/llvm-main/builds/6461#01861c4f-9d9c-4781-88f7-d6ccddcb4b06/919-8848
- https://lab.llvm.org/buildbot/#/builders/94/builds/13196
- https://lab.llvm.org/buildbot/#/builders/45/builds/10633
- https://lab.llvm.org/buildbot/#/builders/247/builds/1238
- https://lab.llvm.org/buildbot/#/builders/70/builds/33424
- https://lab.llvm.org/buildbot/#/builders/168/builds/11693
- https://lab.llvm.org/buildbot/#/builders/74/builds/17006
- https://lab.llvm.org/buildbot/#/builders/85/builds/14120