[wasm] Add support for import section.

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/machine-type.h"
 #include "src/signature.h"
 
@@ skipping 50 matching lines @@
 
   // Bitfields for the various annotations for memory accesses.
   typedef BitField<Alignment, 7, 1> AlignmentField;
   typedef BitField<Atomicity, 5, 2> AtomicityField;
   typedef BitField<bool, 4, 1> OffsetField;
 };
 
 typedef Signature<LocalType> FunctionSig;
 std::ostream& operator<<(std::ostream& os, const FunctionSig& function);
 
+// TODO(titzer): Renumber all the opcodes to fill in holes.
+
 // Control expressions and blocks.
 #define FOREACH_CONTROL_OPCODE(V) \
   V(Nop, 0x00, _)                 \
   V(Block, 0x01, _)               \
   V(Loop, 0x02, _)                \
   V(If, 0x03, _)                  \
   V(IfElse, 0x04, _)              \
   V(Select, 0x05, _)              \
   V(Br, 0x06, _)                  \
   V(BrIf, 0x07, _)                \
   V(TableSwitch, 0x08, _)         \
   V(Return, 0x14, _)              \
   V(Unreachable, 0x15, _)
-// TODO(titzer): numbering
 
 // Constants, locals, globals, and calls.
 #define FOREACH_MISC_OPCODE(V) \
   V(I8Const, 0x09, _)          \
   V(I32Const, 0x0a, _)         \
   V(I64Const, 0x0b, _)         \
   V(F64Const, 0x0c, _)         \
   V(F32Const, 0x0d, _)         \
   V(GetLocal, 0x0e, _)         \
   V(SetLocal, 0x0f, _)         \
   V(LoadGlobal, 0x10, _)       \
   V(StoreGlobal, 0x11, _)      \
   V(CallFunction, 0x12, _)     \
-  V(CallIndirect, 0x13, _)
+  V(CallIndirect, 0x13, _)     \
+  V(CallImport, 0x1F, _)
 
 // Load memory expressions.
 #define FOREACH_LOAD_MEM_OPCODE(V) \
   V(I32LoadMem8S, 0x20, i_i)       \
   V(I32LoadMem8U, 0x21, i_i)       \
   V(I32LoadMem16S, 0x22, i_i)      \
   V(I32LoadMem16U, 0x23, i_i)      \
   V(I64LoadMem8S, 0x24, l_i)       \
   V(I64LoadMem8U, 0x25, l_i)       \
   V(I64LoadMem16S, 0x26, l_i)      \
@@ skipping 358 matching lines @@
       default:
         return "<unknown>";
     }
   }
 };
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_OPCODES_H_