[NFC] Remove unused function parameter.

Author: varungandhi-apple

include/swift/AST/ASTContext.h

@@ -606,7 +606,6 @@ class ASTContext final {
   const clang::Type *
   getCanonicalClangFunctionType(
     ArrayRef<SILParameterInfo> params, Optional<SILResultInfo> result,
-    const SILFunctionType::ExtInfo incompleteExtInfo,
     SILFunctionType::Representation trueRep);
 
   /// Get the Swift declaration that a Clang declaration was exported from,

lib/AST/ASTContext.cpp

@@ -4477,7 +4477,6 @@ const clang::Type *
 ASTContext::getCanonicalClangFunctionType(
     ArrayRef<SILParameterInfo> params,
     Optional<SILResultInfo> result,
-    SILFunctionType::ExtInfo incompleteExtInfo,
     SILFunctionType::Representation trueRep) {
   auto *ty = getClangTypeConverter().getFunctionType(params, result, trueRep);
   return ty ? ty->getCanonicalTypeInternal().getTypePtr() : nullptr;