[wasm] Support undefined indirect table entries, behind a flag.

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 4a9faf0b000f63efbdabf051d0afbd4ee7a789d6..51c979ae660af7e21a8610b69c158c1fd1f0eb6c 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -101,6 +101,9 @@ static const size_t kDeclDataSegmentSize = 13;
 
 static const uint32_t kMaxReturnCount = 1;
 
+// minimum number of entries in the table for JITing
+static const uint32_t kMinimumIndirectTableSize = 1024;
+
 // Static representation of a WASM function.
 struct WasmFunction {
   FunctionSig* sig;      // signature of the function.
@@ -229,6 +232,8 @@ struct WasmModuleInstance {
   size_t mem_size;  // size of the linear memory.
   // -- raw globals -----------------------------------------------------------
   byte* globals_start;  // start of the globals area.
+  // -- indirect function table information -----------------------------------
+  int padded_entries;  // number of entries padded to the indirect func. table
 
   explicit WasmModuleInstance(const WasmModule* m)
       : module(m),