[WebAssembly] Remove an unused data member. NFC.

llvm-svn: 258192
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
index 37000f1..cf88f5f 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
@@ -63,8 +63,8 @@
 
 static MCCodeEmitter *createCodeEmitter(const MCInstrInfo &MCII,
                                         const MCRegisterInfo & /*MRI*/,
-                                        MCContext &Ctx) {
-  return createWebAssemblyMCCodeEmitter(MCII, Ctx);
+                                        MCContext & /*Ctx*/) {
+  return createWebAssemblyMCCodeEmitter(MCII);
 }
 
 static MCAsmBackend *createAsmBackend(const Target & /*T*/,