[wasm] Add stack checks at the beginning of each function.

src/wasm/ast-decoder.cc

Index: src/wasm/ast-decoder.cc
diff --git a/src/wasm/ast-decoder.cc b/src/wasm/ast-decoder.cc
index 740199c29817a5a6ab4cf4ffb6a37f1bd16ec3e1..0f192508ba7d47211f380a4a48c724693202638c 100644
--- a/src/wasm/ast-decoder.cc
+++ b/src/wasm/ast-decoder.cc
@@ -559,6 +559,9 @@ class WasmFullDecoder : public WasmDecoder {
     ssa_env->control = start;
     ssa_env->effect = start;
     SetEnv("initial", ssa_env);
+    if (builder_) {
+      builder_->StackCheck(position());
+    }
   }
 
   TFNode* DefaultValue(LocalType type) {