[ClangImporter] Use the current ImportNameVersion for param names.

This shouldn't have any effect since we've never customized how
parameter names are imported (body names, not argument labels), but it
removes special cases.

Author: jrose-apple

lib/ClangImporter/ImportType.cpp

@@ -1626,7 +1626,7 @@ ParameterList *ClangImporter::Implementation::importFunctionParameterList(
     }
 
     // Figure out the name for this parameter.
-    Identifier bodyName = importFullName(param, ImportNameVersion::Swift3)
+    Identifier bodyName = importFullName(param, CurrentVersion)
                               .getDeclName()
                               .getBaseName();
 
@@ -2037,7 +2037,7 @@ Type ClangImporter::Implementation::importMethodType(
     }
 
     // Figure out the name for this parameter.
-    Identifier bodyName = importFullName(param, ImportNameVersion::Swift3)
+    Identifier bodyName = importFullName(param, CurrentVersion)
                               .getDeclName()
                               .getBaseName();
 
@@ -2194,7 +2194,7 @@ Type ClangImporter::Implementation::importAccessorMethodType(
 
   } else {
     const clang::ParmVarDecl *param = clangDecl->parameters().front();
-    ImportedName fullBodyName = importFullName(param,ImportNameVersion::Swift3);
+    ImportedName fullBodyName = importFullName(param, CurrentVersion);
     Identifier bodyName = fullBodyName.getDeclName().getBaseName();
     SourceLoc nameLoc = importSourceLoc(param->getLocation());
     Identifier argLabel = functionName.getDeclName().getArgumentNames().front();