[sil-deserialization] Implement cache invalidation for all serialized SIL entities and use it to properly invalidate global variables/witness tables when we delete them.

Otherwise, one runs into memory corruption. I ran into this while enabling ossa
on the stdlib for non-Darwin platforms.

Hopefully we do not regress on this again when someone adds more optzns that
eliminate these since I added a big NOTE to warn people to do it and implemented
support even for the entities we do not support deleting at the SIL
level... yet.

lib/Serialization/SerializedSILLoader.cpp

@@ -144,14 +144,58 @@ SerializedSILLoader::lookupDifferentiabilityWitness(
   return dw;
 }
 
-void SerializedSILLoader::invalidateCaches() {
-  for (auto &Des : LoadedSILSections)
-    Des->invalidateFunctionCache();
+void SerializedSILLoader::invalidateAllCaches() {
+  for (auto &des : LoadedSILSections)
+    des->invalidateAllCaches();
 }
 
-bool SerializedSILLoader::invalidateFunction(SILFunction *F) {
-  for (auto &Des : LoadedSILSections)
-    if (Des->invalidateFunction(F))
+bool SerializedSILLoader::invalidateFunction(SILFunction *fn) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateFunction(fn))
+      return true;
+  return false;
+}
+
+bool SerializedSILLoader::invalidateGlobalVariable(SILGlobalVariable *gv) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateGlobalVariable(gv))
+      return true;
+  return false;
+}
+
+bool SerializedSILLoader::invalidateVTable(SILVTable *vt) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateVTable(vt))
+      return true;
+  return false;
+}
+
+bool SerializedSILLoader::invalidateWitnessTable(SILWitnessTable *wt) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateWitnessTable(wt))
+      return true;
+  return false;
+}
+
+bool SerializedSILLoader::invalidateDefaultWitnessTable(
+    SILDefaultWitnessTable *wt) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateDefaultWitnessTable(wt))
+      return true;
+  return false;
+}
+
+bool SerializedSILLoader::invalidateProperty(SILProperty *p) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateProperty(p))
+      return true;
+  return false;
+}
+
+bool SerializedSILLoader::invalidateDifferentiabilityWitness(
+    SILDifferentiabilityWitness *w) {
+  for (auto &des : LoadedSILSections)
+    if (des->invalidateDifferentiabilityWitness(w))
       return true;
   return false;
 }