[table64] Preserve 64-bit table flag when writing binaries (#6610)

Author: sbc100

src/wasm/wasm-binary.cpp

@@ -365,7 +365,7 @@ void WasmBinaryWriter::writeImports() {
                          table->max,
                          table->hasMax(),
                          /*shared=*/false,
-                         /*is64*/ false);
+                         table->is64());
   });
   finishSection(start);
 }

test/lit/table64.wast

@@ -0,0 +1,11 @@
+;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.
+;; RUN: wasm-opt %s -all --roundtrip -S -o - | filecheck %s
+
+
+;; Most table64 test coverage is handled by the spec tests.
+;; Here we test what the spec doesn't cover, currently just the i64 flag
+;; is preserved on table imports during roundtripping.
+(module
+ (import "env" "table" (table i64 1 funcref))
+)
+;; CHECK:      (import "env" "table" (table $timport$0 i64 1 funcref))