Enable FinalizeQueue SOS command for Unix (#21876)

The command is very useful and there seems to be no reason for it to not to be enabled on Unix.

src/ToolBox/SOS/Strike/sos_unixexports.src

@@ -29,6 +29,7 @@ EEHeap
 GCWhere
 EEStack
 EHInfo
+FinalizeQueue
 FindAppDomain
 GCInfo
 GCRoot

src/ToolBox/SOS/Strike/sosdocsunix.txt

@@ -30,9 +30,9 @@ DumpDelegate (dumpdelegate)        u (clru)
 DumpStackObjects (dso)             DumpStack (dumpstack)
 DumpHeap (dumpheap)                EEStack (eestack)
 DumpVC                             CLRStack (clrstack)
-GCRoot (gcroot)                    GCInfo
-PrintException (pe)                EHInfo
-                                   bpmd (bpmd)
+FinalizeQueue (finalizequeue)      GCInfo
+GCRoot (gcroot)                    EHInfo
+PrintException (pe)                bpmd (bpmd)
 
 Examining CLR data structures      Diagnostic Utilities
 -----------------------------      -----------------------------
@@ -432,6 +432,27 @@ DumpVC is quite a specialized function. Some managed programs make heavy use
 of value classes, while others do not.
 \\
 
+COMMAND: finalizequeue
+FinalizeQueue [-detail] | [-allReady] [-short]
+
+Displays all objects registered for finalization.
+The "-detail" option displays extra information about any SyncBlocks that need
+to be cleaned up. This data structure is cached and cleaned up by the 
+finalizer thread when it runs.
+
+The "-allReady" option displays all objects that are ready for finalization,
+regardless of whether they are already marked by the garbage collection
+as such, or will be marked by the next garbage collection. The objects that
+are in the "ready for finalization" list are finalizable objects that are
+no longer rooted. This option can be very expensive, because it verifies
+whether all the objects in the finalizable queues are still rooted.
+
+The "-short" option limits the output to the address of each object. If it is
+used in conjunction with -allReady, it enumerates all objects that have
+a finalizer that are no longer rooted. If it is used independently, it lists
+all objects in the finalizable and "ready for finalization" queues.
+\\
+
 COMMAND: gcroot.
 GCRoot [-nostacks] <Object address>
 

src/ToolBox/SOS/Strike/strike.cpp

@@ -5663,8 +5663,6 @@ DECLARE_API(SyncBlk)
     return Status;
 }
 
-#ifndef FEATURE_PAL
-
 #ifdef FEATURE_COMINTEROP
 struct VisitRcwArgs
 {
@@ -5750,7 +5748,6 @@ DECLARE_API(RCWCleanupList)
 }
 #endif // FEATURE_COMINTEROP
 
-
 /**********************************************************************\
 * Routine Description:                                                 *
 *                                                                      *
@@ -5893,8 +5890,6 @@ DECLARE_API(FinalizeQueue)
     return Status;
 }
 
-#endif // FEATURE_PAL
-
 enum {
     // These are the values set in m_dwTransientFlags.
     // Note that none of these flags survive a prejit save/restore.

src/ToolBox/SOS/lldbplugin/soscommand.cpp

@@ -141,6 +141,7 @@ sosCommandInitialize(lldb::SBDebugger debugger)
     interpreter.AddCommand("dso", new sosCommand("DumpStackObjects"), "Displays all managed objects found within the bounds of the current stack.");
     interpreter.AddCommand("eeheap", new sosCommand("EEHeap"), "Displays info about process memory consumed by internal runtime data structures.");
     interpreter.AddCommand("eestack", new sosCommand("EEStack"), "Runs dumpstack on all threads in the process.");
+    interpreter.AddCommand("finalizequeue", new sosCommand("FinalizeQueue"), "Displays all objects registered for finalization.");
     interpreter.AddCommand("gcroot", new sosCommand("GCRoot"), "Displays info about references (or roots) to an object at the specified address.");
     interpreter.AddCommand("ip2md", new sosCommand("IP2MD"), "Displays the MethodDesc structure at the specified address in code that has been JIT-compiled.");
     interpreter.AddCommand("name2ee", new sosCommand("Name2EE"), "Displays the MethodTable structure and EEClass structure for the specified type or method in the specified module.");