[NFC] Make a function static

Author: AnthonyLatsis

include/swift/Sema/ConstraintSystem.h

@@ -6665,12 +6665,6 @@ bool isSIMDOperator(ValueDecl *value);
 
 std::string describeGenericType(ValueDecl *GP, bool includeName = false);
 
-/// Whether the given parameter requires an argument.
-bool parameterRequiresArgument(
-    ArrayRef<AnyFunctionType::Param> params,
-    const ParameterListInfo &paramInfo,
-    unsigned paramIdx);
-
 } // end namespace swift
 
 namespace llvm {

lib/Sema/CSSimplify.cpp

@@ -279,10 +279,9 @@ static ConstraintSystem::TypeMatchOptions getDefaultDecompositionOptions(
 }
 
 /// Whether the given parameter requires an argument.
-bool swift::parameterRequiresArgument(
-    ArrayRef<AnyFunctionType::Param> params,
-    const ParameterListInfo &paramInfo,
-    unsigned paramIdx) {
+static bool parameterRequiresArgument(ArrayRef<AnyFunctionType::Param> params,
+                                      const ParameterListInfo &paramInfo,
+                                      unsigned paramIdx) {
   return !paramInfo.hasDefaultArgument(paramIdx)
       && !params[paramIdx].isVariadic();
 }