Add wasm internal opcodes for asm.js stdlib functions we're missing.

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 e6e9bb49f40430e7b9621610f6cd3d6335969392..b4af1b388fcefd6f467db1393d391db524de8d2d 100644
--- a/src/wasm/ast-decoder.cc
+++ b/src/wasm/ast-decoder.cc
@@ -293,6 +293,7 @@ class WasmDecoder : public Decoder {
         FOREACH_STORE_MEM_OPCODE(DECLARE_OPCODE_CASE)
         FOREACH_MISC_MEM_OPCODE(DECLARE_OPCODE_CASE)
         FOREACH_SIMPLE_OPCODE(DECLARE_OPCODE_CASE)
+        FOREACH_ASMJS_COMPAT_OPCODE(DECLARE_OPCODE_CASE)
 #undef DECLARE_OPCODE_CASE
     }
     UNREACHABLE();