[reference-types] Support passive elem segments (#3572)

Passive element segments do not belong to any table, so the link between
Table and elem needs to be weaker; i.e. an elem may have a table in case
of active segments, or simply be a collection of function references in
case of passive/declarative segments.

This PR takes Table::Segment out and turns it into a first class module
element just like tables and functions. It also implements early support
for parsing, printing, encoding and decoding passive/declarative elem
segments.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/passes/ReorderFunctions.cpp b/src/passes/ReorderFunctions.cpp
index 4d02616f0..0c95101a5 100644
--- a/src/passes/ReorderFunctions.cpp
+++ b/src/passes/ReorderFunctions.cpp
@@ -70,11 +70,9 @@ struct ReorderFunctions : public Pass {
     for (auto& curr : module->exports) {
       counts[curr->value]++;
     }
-    for (auto& table : module->tables) {
-      for (auto& segment : table->segments) {
-        for (auto& curr : segment.data) {
-          counts[curr]++;
-        }
+    for (auto& segment : module->elementSegments) {
+      for (auto& curr : segment->data) {
+        counts[curr]++;
       }
     }
     // sort