[wasm] Use the proper constant for exports limit

R=gdeepti@chromium.org

Change-Id: I3d0a21c6db671718b9f41fb8392f6900b2fecf27
Reviewed-on: https://chromium-review.googlesource.com/1013197Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52608}

src/wasm/module-decoder.cc

@@ -580,7 +580,7 @@ class ModuleDecoderImpl : public Decoder {
 
   void DecodeExportSection() {
     uint32_t export_table_count =
-        consume_count("exports count", kV8MaxWasmImports);
+        consume_count("exports count", kV8MaxWasmExports);
     module_->export_table.reserve(export_table_count);
     for (uint32_t i = 0; ok() && i < export_table_count; ++i) {
       TRACE("DecodeExportTable[%d] module+%d\n", i,