[lld][wasm] Clear lazyBitcodeFiles while resetting context (#118440)

Hi @sbc100 

I was looking into a use case involving the link function (which got my
attention to reset).

I see that `lazyBitcodeFiles` variable was introduced here
#114327 but I don't see it
being reset while destroying the context eventually. Hopefully this
should be the correct way to address it.

Author: anutosh491

lld/wasm/Driver.cpp

@@ -59,6 +59,7 @@ void Ctx::reset() {
   stubFiles.clear();
   sharedFiles.clear();
   bitcodeFiles.clear();
+  lazyBitcodeFiles.clear();
   syntheticFunctions.clear();
   syntheticGlobals.clear();
   syntheticTables.clear();