SILGen: "sort" the witness tables in declaration order

Emit the tables in the declaration order.  This ensures that we get identical
emission ordering across Windows and Linux.  This imporves the test pass rate on
Windows for the SILGen tests.

Author: compnerd

lib/SILGen/SILGenType.cpp

@@ -969,7 +969,7 @@ class SILGenType : public TypeMemberVisitor<SILGenType> {
     // are existential and do not have witness tables.
     for (auto *conformance : theType->getLocalConformances(
                                ConformanceLookupKind::All,
-                               nullptr, /*sorted=*/true)) {
+                               nullptr, /*sorted=*/false)) {
       if (conformance->isComplete() &&
           isa<NormalProtocolConformance>(conformance))
         SGM.getWitnessTable(conformance);
@@ -1064,7 +1064,7 @@ class SILGenExtension : public TypeMemberVisitor<SILGenExtension> {
       // extension.
       for (auto *conformance : e->getLocalConformances(
                                  ConformanceLookupKind::All,
-                                 nullptr, /*sorted=*/true)) {
+                                 nullptr, /*sorted=*/false)) {
         if (conformance->isComplete() &&
             isa<NormalProtocolConformance>(conformance))
           SGM.getWitnessTable(conformance);