[wasm] Fix decoding of shared global index space

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index 3a4ac2dbef552e48cb2562ed785b3c3120a403b5..07addae634a15a0535e4c23866f0db8868c581b6 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -1546,6 +1546,9 @@ class WasmInstanceBuilder {
 
       uint32_t source_size =
           static_cast<uint32_t>(segment->get_int(kSourceSize));
+      // TODO(titzer): These should be runtime errors and not CHECKs if
+      // dest_addr is global (and therefore initialized at linktime to an
+      // possibly-invalid value).
       CHECK_LT(dest_addr, mem_size);
       CHECK_LE(source_size, mem_size);
       CHECK_LE(dest_addr, mem_size - source_size);