[WebAssembly] Hotfix of WebAssemblyInstructionTableSize after rL346465

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346535 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp

@@ -36,6 +36,8 @@ using DecodeStatus = MCDisassembler::DecodeStatus;
 #include "WebAssemblyGenDisassemblerTables.inc"
 
 namespace {
+static constexpr int WebAssemblyInstructionTableSize = 256;
+
 class WebAssemblyDisassembler final : public MCDisassembler {
   std::unique_ptr<const MCInstrInfo> MCII;