Make sure EnsureInitialize() loads the GcInfo if it is there (#53896)

src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ILCompiler.Reflection.ReadyToRun.csproj

@@ -14,7 +14,6 @@
     <OutputPath>$(RuntimeBinDir)</OutputPath>
     <Platforms>AnyCPU;x64</Platforms>
     <PlatformTarget>AnyCPU</PlatformTarget>
-    <LangVersion>7.3</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs

@@ -305,7 +305,7 @@ private void EnsureRuntimeFunctions()
             if (this._runtimeFunctions == null)
             {
                 this._runtimeFunctions = new List<RuntimeFunction>();
-                this.ParseRuntimeFunctions();
+                this.ParseRuntimeFunctions(false);
             }
         }
 
@@ -474,17 +474,21 @@ public IReadOnlyList<FixupCell> Fixups
 
         private void EnsureInitialized()
         {
-            if (_gcInfo == null && GcInfoRva != 0)
+            if (_gcInfo == null)
             {
-                int gcInfoOffset = _readyToRunReader.CompositeReader.GetOffset(GcInfoRva);
-                if (_readyToRunReader.Machine == Machine.I386)
-                {
-                    _gcInfo = new x86.GcInfo(_readyToRunReader.Image, gcInfoOffset, _readyToRunReader.Machine, _readyToRunReader.ReadyToRunHeader.MajorVersion);
-                }
-                else
+                ParseRuntimeFunctions(true);
+                if (GcInfoRva != 0)
                 {
-                    // Arm and Arm64 use the same GcInfo format as Amd64
-                    _gcInfo = new Amd64.GcInfo(_readyToRunReader.Image, gcInfoOffset, _readyToRunReader.Machine, _readyToRunReader.ReadyToRunHeader.MajorVersion);
+                    int gcInfoOffset = _readyToRunReader.CompositeReader.GetOffset(GcInfoRva);
+                    if (_readyToRunReader.Machine == Machine.I386)
+                    {
+                        _gcInfo = new x86.GcInfo(_readyToRunReader.Image, gcInfoOffset, _readyToRunReader.Machine, _readyToRunReader.ReadyToRunHeader.MajorVersion);
+                    }
+                    else
+                    {
+                        // Arm and Arm64 use the same GcInfo format as Amd64
+                        _gcInfo = new Amd64.GcInfo(_readyToRunReader.Image, gcInfoOffset, _readyToRunReader.Machine, _readyToRunReader.ReadyToRunHeader.MajorVersion);
+                    }
                 }
             }
             if (_pgoInfo == null)
@@ -547,7 +551,7 @@ private void EnsureFixupCells()
         /// Get the RVAs of the runtime functions for each method
         /// based on <a href="https://github.com/dotnet/coreclr/blob/master/src/zap/zapcode.cpp">ZapUnwindInfo::Save</a>
         /// </summary>
-        private void ParseRuntimeFunctions()
+        private void ParseRuntimeFunctions(bool partial)
         {
             int runtimeFunctionId = EntryPointRuntimeFunctionId;
             int runtimeFunctionSize = _readyToRunReader.CalculateRuntimeFunctionSize();
@@ -602,6 +606,11 @@ private void ParseRuntimeFunctions()
                     }
                 }
 
+                if (partial)
+                {
+                    return;
+                }
+
                 RuntimeFunction rtf = new RuntimeFunction(
                     _readyToRunReader,
                     runtimeFunctionId,