[WebAssembly] Implement unaligned loads and stores.

Differential Revision: http://reviews.llvm.org/D16534


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258779 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp

@@ -93,6 +93,7 @@ MCDisassembler::DecodeStatus WebAssemblyDisassembler::getInstruction(
     const MCOperandInfo &Info = Desc.OpInfo[i];
     switch (Info.OperandType) {
     case MCOI::OPERAND_IMMEDIATE:
+    case WebAssembly::OPERAND_P2ALIGN:
     case WebAssembly::OPERAND_BASIC_BLOCK: {
       if (Pos + sizeof(uint64_t) > Bytes.size())
         return MCDisassembler::Fail;