Fix singlefile on OSX ARM64 (#68845) (#69930)

* Same alignment in the bundle on OSX as on Linux

* Extra VA gap between section in casse we run from sf bundle

* Rename prevSectionEnd -> prevSectionEndAligned and make it aligned.

* Suppress assert for now on OSX

src/installer/managed/Microsoft.NET.HostModel/Bundle/TargetInfo.cs

@@ -57,7 +57,7 @@ public TargetInfo(OSPlatform? os, Architecture? arch, Version targetFrameworkVer
                 throw new ArgumentException($"Invalid input: Unsupported Target Framework Version {targetFrameworkVersion}");
             }
 
-            if (IsLinux && Arch == Architecture.Arm64)
+            if (Arch == Architecture.Arm64)
             {
                 // We align assemblies in the bundle at 4K so that we can use mmap on Linux without changing the page alignment of ARM64 R2R code.
                 // This is only necessary for R2R assemblies, but we do it for all assemblies for simplicity.