Revert D105519 "[WebAssembly] Deduplicate imports of the same module name,...
Revert D105519 "[WebAssembly] Deduplicate imports of the same module name, field name, and type" and its followup
This reverts commit 4ae575b9 and 9b965b37.
There is an use-of-uninitialized-value bug in the `else` branch in ImportSection::addImport.