Merge pull request #3941 from jasonmolenda/r88802629-manual-load-address-computation-fix

Alt mechanism to find the first loadable seg in a Mach-O binary

Author: JDevlieghere

lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp

@@ -6261,6 +6261,15 @@ Section *ObjectFileMachO::GetMachHeaderSection() {
     if (section->GetFileOffset() == 0 && SectionIsLoadable(section))
       return section;
   }
+
+  // We may have a binary in the shared cache that has a non-zero
+  // file address for its first segment, traditionally the __TEXT segment.
+  // Search for it by name and return it as our next best guess.
+  SectionSP text_segment_sp =
+      GetSectionList()->FindSectionByName(GetSegmentNameTEXT());
+  if (text_segment_sp.get() && SectionIsLoadable(text_segment_sp.get()))
+    return text_segment_sp.get();
+
   return nullptr;
 }