[wasm] Remove non-standard kExprI8Const bytecode

src/wasm/wasm-opcodes.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_OPCODES_H_
 #define V8_WASM_OPCODES_H_
 
 #include "src/globals.h"
 #include "src/machine-type.h"
 #include "src/runtime/runtime.h"
@@ skipping 60 matching lines @@
   V(Drop, 0x1a, _)             \
   V(Select, 0x1b, _)           \
   V(GetLocal, 0x20, _)         \
   V(SetLocal, 0x21, _)         \
   V(TeeLocal, 0x22, _)         \
   V(GetGlobal, 0x23, _)        \
   V(SetGlobal, 0x24, _)        \
   V(I32Const, 0x41, _)         \
   V(I64Const, 0x42, _)         \
   V(F32Const, 0x43, _)         \
-  V(F64Const, 0x44, _)         \
-  V(I8Const, 0xcb, _ /* TODO(titzer): V8 specific, remove */)
+  V(F64Const, 0x44, _)
 
 // Load memory expressions.
 #define FOREACH_LOAD_MEM_OPCODE(V) \
   V(I32LoadMem, 0x28, i_i)         \
   V(I64LoadMem, 0x29, l_i)         \
   V(F32LoadMem, 0x2a, f_i)         \
   V(F64LoadMem, 0x2b, d_i)         \
   V(I32LoadMem8S, 0x2c, i_i)       \
   V(I32LoadMem8U, 0x2d, i_i)       \
   V(I32LoadMem16S, 0x2e, i_i)      \
@@ skipping 585 matching lines @@
       default:
         return "<unknown>";
     }
   }
 };
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_OPCODES_H_