Fix IndexOutOfRangeException in PEImage.DoRead relocation handling

[leculver]

Fix bug where negative BinarySearch results were used as array indices instead of their bitwise complements in DoRead's relocation handling.

beginSearch Case 3: beginRelocation = beginSearch - 1 -> beginSearchComplement - 1
endSearch Case 3: endRelocation = endSearch -> endSearchComplement

Fixes #1288

[Copilot]

Pull request overview

Fixes a crash in ClrMD’s PE image reader (PEImage.DoRead) when applying relocations by correctly handling negative Array.BinarySearch results (using the bitwise complement insertion index instead of the negative return value). This aligns with the reported IndexOutOfRangeException in issue #1288 and improves robustness when reading PE data from partial/virtualized sources (e.g., dumps produced by dotnet-monitor).

Changes:

• Corrected relocation start index calculation when the read begins inside a relocation (use beginSearchComplement - 1).
• Corrected relocation end index calculation when the read ends inside a relocation (use endSearchComplement).
• Updated related Debug.Assert checks to validate the corrected indices.