[DSC] Wrap section creation within BeginBulkAddSegments / EndBulkAddSegments

This defers rebuilding of the section map until after all sections for
an image have been added, rather than having the section map be rebuilt
after adding each section.

Author: bdash

view/sharedcache/core/MachOProcessor.cpp

@@ -31,12 +31,15 @@ void SharedCacheMachOProcessor::ApplyHeader(const SharedCache& cache, SharedCach
 	};
 
 	// Add a section for the header itself.
+	m_view->BeginBulkAddSegments();
 	std::string headerSection = fmt::format("{}::__macho_header", header.identifierPrefix);
 	uint64_t machHeaderSize = m_vm->GetAddressSize() == 8 ? sizeof(mach_header_64) : sizeof(mach_header);
 	uint64_t headerSectionSize = machHeaderSize + header.ident.sizeofcmds;
 	m_view->AddUserSection(headerSection, header.textBase, headerSectionSize, ReadOnlyDataSectionSemantics);
 
 	ApplyHeaderSections(header);
+	m_view->EndBulkAddSegments();
+
 	ApplyHeaderDataVariables(header);
 
 	// Pull the available type library for the image we are loading, so we can apply known types.