[RemoteMirrors] Fix losing the remote address on StaticMirror

The Offset field of a DynamicRelocation is either an offset or a remote
address, but was being treated only as a remote address on
getDynamicSymbol.

(cherry picked from commit 3c331fc)

Author: augusto2112

include/swift/StaticMirror/ObjectFileContext.h

@@ -39,7 +39,11 @@ class Image {
   uint64_t HeaderAddress;
   std::vector<Segment> Segments;
   struct DynamicRelocation {
+    /// The symbol name that the pointer refers to. Empty if only an absolute
+    /// address is available.
     StringRef Symbol;
+    // The offset (if the symbol is available), or the resolved remote address
+    // if the symbol is empty.
     uint64_t Offset;
   };
   llvm::DenseMap<uint64_t, DynamicRelocation> DynamicRelocations;

lib/StaticMirror/ObjectFileContext.cpp

@@ -332,9 +332,11 @@ remote::RemoteAbsolutePointer Image::getDynamicSymbol(uint64_t Addr) const {
   auto found = DynamicRelocations.find(Addr);
   if (found == DynamicRelocations.end())
     return nullptr;
-  return remote::RemoteAbsolutePointer(found->second.Symbol,
-                                       found->second.Offset,
-                                       remote::RemoteAddress((uint64_t)0));
+  if (!found->second.Symbol.empty())
+    return remote::RemoteAbsolutePointer(
+        found->second.Symbol, found->second.Offset, remote::RemoteAddress());
+  return remote::RemoteAbsolutePointer(remote::RemoteAddress(
+      found->second.Offset, remote::RemoteAddress::DefaultAddressSpace));
 }
 
 std::pair<const Image *, uint64_t>

test/Reflection/conformance_descriptors.swift

@@ -2,9 +2,6 @@
 //
 // LC_DYLD_CHAINED_FIXUPS decode not currently supported (default on visionOS)
 // UNSUPPORTED: OS=xros
-//
-// Temporarily disable on AArch64 Linux (rdar://88451721)
-// UNSUPPORTED: OS=linux-gnu && CPU=aarch64
 
 // rdar://100558042
 // UNSUPPORTED: CPU=arm64e

test/Reflection/typeref_decoding.swift

@@ -8,9 +8,6 @@
 
 // RUN: %empty-directory(%t)
 
-// FIXME: rdar://127796117
-// UNSUPPORTED: OS=linux-gnu && CPU=aarch64
-
 // RUN: %target-build-swift -target %target-swift-5.2-abi-triple -Xfrontend -enable-anonymous-context-mangled-names %S/Inputs/ConcreteTypes.swift %S/Inputs/GenericTypes.swift %S/Inputs/Protocols.swift %S/Inputs/Extensions.swift %S/Inputs/Closures.swift -parse-as-library -emit-module -emit-library %no-fixup-chains -module-name TypesToReflect -o %t/%target-library-name(TypesToReflect)
 // RUN: %target-build-swift -target %target-swift-5.2-abi-triple -Xfrontend -enable-anonymous-context-mangled-names %S/Inputs/ConcreteTypes.swift %S/Inputs/GenericTypes.swift %S/Inputs/Protocols.swift %S/Inputs/Extensions.swift %S/Inputs/Closures.swift %S/Inputs/main.swift -emit-module -emit-executable %no-fixup-chains -module-name TypesToReflect -o %t/TypesToReflect