[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 2ac04253d72b27b09897a5620f6a569b7bdf064f..51f5fee9cd0dfb22fec7aed7244ddd066277746f 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -105,6 +105,9 @@ 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.
@@ -235,6 +238,8 @@ struct WasmModuleInstance {
   // -- raw globals -----------------------------------------------------------
   byte* globals_start;  // start of the globals area.
   size_t globals_size;  // size of the globals area.
+  // -- indirect function table information -----------------------------------
+  int padded_entries;  // number of entries padded to the indirect func. table
 
   explicit WasmModuleInstance(WasmModule* m)
       : module(m),