Completely disable using prespecializations from SwiftOnoneSupport

Author: slavapestov

lib/SILOptimizer/Utils/Generics.cpp

@@ -2527,6 +2527,8 @@ static const char *const KnownPrespecializations[] = {
 };
 
 bool swift::isKnownPrespecialization(StringRef SpecName) {
+  // Completely disable for now.
+#if false
   // TODO: Once there is an efficient API to check if
   // a given symbol is a specialization of a specific type,
   // use it instead. Doing demangling just for this check
@@ -2577,6 +2579,7 @@ bool swift::isKnownPrespecialization(StringRef SpecName) {
     }
   }
 
+#endif
   return false;
 }
 

test/SILOptimizer/prespecialize.swift

@@ -1,5 +1,8 @@
 // RUN: %target-swift-frontend  %s -Onone -Xllvm -sil-inline-generics=false -emit-sil | %FileCheck %s
 
+// This is disabled for now.
+// REQUIRES: rdar48924409
+
 // REQUIRES: optimized_stdlib
 
 // Check that pre-specialization works at -Onone.