[RemoteInspection] Change RemoteAbsolutePointer (NFC)

This patch changes RemoteAbsolutePointer to store both the symbol and
the resolved address. This allows us to retire some ugly workarounds
to deal with non-symbolic addresses and it fixes code paths that would
need these workarounds, but haven't implemented them yet (i.e., the
pack shape handling in the symbolicReferenceResolver in MetadatyaReader.

Addresses parts of rdar://146273066.
rdar://153687085

(cherry picked from commit 9381a54c67)
(cherry picked from commit a6eafcb311)

include/swift/Remote/MemoryReader.h

@@ -147,7 +147,7 @@ public:
   virtual RemoteAbsolutePointer resolvePointer(RemoteAddress address,
                                                uint64_t readValue) {
     // Default implementation returns the read value as is.
-    return RemoteAbsolutePointer("", readValue);
+    return RemoteAbsolutePointer(RemoteAddress(readValue));
   }
 
   /// Performs the inverse operation of \ref resolvePointer.
@@ -166,7 +166,7 @@ public:
   virtual RemoteAbsolutePointer getSymbol(RemoteAddress address) {
     if (auto symbol = resolvePointerAsSymbol(address))
       return *symbol;
-    return RemoteAbsolutePointer("", address.getAddressData());
+    return RemoteAbsolutePointer(address);
   }
 
   /// Lookup a dynamic symbol name (ie dynamic loader binding) for the given