Add cross IBCMerge (#33282)

* Add cross IBCMerge

Currently we cannot apply IBC data on Linux so we need to apply the data
on Windows. This script will handle the application of the Linux IBC
data on Windows.

* Address feedback

* Move script to eng dir

* Add path parameter

* Remove debug code

eng/crossIBC.ps1

@@ -0,0 +1,73 @@
+#This script is for applying IBC data to Linux binaries on Windows. This is because currently IBCMerge does not run on Linux.
+#It assumes that the binary output of a Linux build will live in a directory called Linux in the root of the repo, and it leaves
+#the optimized binaries in a directory called Optimized.
+param(
+    [Parameter(Mandatory=$true)][string]$ToolSource,
+    [Parameter(Mandatory=$true)][string]$ToolUser,
+    [Parameter(Mandatory=$true)][string]$ToolPAT,
+    [Parameter(Mandatory=$true)][string]$RepoRoot,
+    [bool]$UsePartialNgen
+)
+
+#There seems to be a bug in the optional tool restore step that causes those packages to be downloaded to the root of the drive.
+#That is why we have to look in both the root and the packages directory for IBCMerge.
+function Find-IBCMerge {
+    $IBCMergePath = gci -recurse .\.packages | where {$_.Name.Contains("ibcmerge.exe")}
+    if(!$IBCMergePath)
+    {
+        Write-Error -Category ResourceUnavailable "Could not find IBCMerge.exe"
+        exit
+    }
+    $IBCMergePath.FullName
+}
+
+#Both the Preprocess-IBCMerge and Apply-IBCData are taken directly from the steps done in codeOptimization.targets
+function Preprocess-IBCMerge
+{
+    foreach($file in gci -recurse .packages\optimization.linux-x64.ibc.corefx\*.dll)
+    {
+        & $IBCMerge -q -f -delete -mo $file.FullName $file.FullName.Replace(".dll", ".ibc")
+        & $IBCMerge -mi $file.FullName
+    }
+}
+
+function Apply-IBCData
+{
+    $pwd = (Get-Item -Path ".\").FullName
+    foreach($file in gci -recurse .packages\optimization.linux-x64.ibc.corefx\*.dll)
+    {
+        #Here we look through all of the Linux binaries for the implementation dll that matches in name to the IBC data
+        $fileToOptimize = gci -recurse Linux\*Linux*\*.dll | where {$_.Name.Contains($file.Name)} | where {$_.FullName.Contains("netcoreapp")}
+        if(!$fileToOptimize)
+        {
+            $fileToOptimize = gci -recurse Linux\*Unix*\*.dll | where {$_.Name.Contains($file.Name)} | where {$_.FullName.Contains("netcoreapp")}
+        }
+        if(!$fileToOptimize)
+        {
+            $fileToOptimize = gci -recurse Linux\*AnyOS*\*.dll | where {$_.Name.Contains($file.Name)} | where {$_.FullName.Contains("netcoreapp")} | where {!$_.FullName.Contains("netfx")}
+        }
+        if($fileToOptimize)
+        {
+            if(!$UsePartialNgen)
+            {
+                Write-Host "$IBCMerge -q -f -mo $fileToOptimize -incremental $file"
+                & $IBCMerge -q -f -mo $fileToOptimize -incremental $file
+            }
+            else
+            {
+                & $IBCMerge -q -f -mo $fileToOptimize -incremental $file -partialNGEN -minify
+            }
+            $copyLocation = Join-Path -Path $pwd -ChildPath "Optimized"
+            Write-Host "Copy-Item $fileToOptimize -Destination $copyLocation"
+            Copy-Item $fileToOptimize -Destination $copyLocation
+        }
+    }
+}
+
+pushd $RepoRoot
+.\build.cmd -restore /p:OptionalToolSource=$ToolSource /p:OptionalToolSourceUser=$ToolUser /p:OptionalToolSourcePassword=$ToolPAT /p:EnableProfileGuidedOptimization=true /p:IBCTarget=Linux -release -ci
+mkdir Optimized
+$IBCMerge = Find-IBCMerge
+Preprocess-IBCMerge
+Apply-IBCData
+popd