Rebase: [Facebook] Revert "[BOLT] Update dynamic relocations from section relocations"

Summary:
This reverts commit 729d29e1.

Needed as a workaround for T112872562.

Manual rebase conflict history:
https://phabricator.intern.facebook.com/D35230076
https://phabricator.intern.facebook.com/D35681740

Test Plan: sandcastle

Reviewers: #llvm-bolt

Subscribers: spupyrev

Differential Revision: https://phabricator.intern.facebook.com/D37098481