Backport gfx1154 support into ZLUDA's Windows LLVM compiler

Adapt official LLVM 7a0829e41228 to the pinned LLVM 22 parser and ELF structures. Apply and audit the complete source delta before building, export its provenance, and package the source patch. Add 33 offline public PTX compilation checks across all eleven GPU targets without hardware execution. Preserve strict arithmetic and document RX9070XT K/M regressions.

scripts/windows/prepare-zluda-llvm-source.ps1

@@ -0,0 +1,34 @@
+[CmdletBinding()]
+param([Parameter(Mandatory=$true)][string]$LlvmSourceRoot)
+$ErrorActionPreference='Stop'
+$repo=[IO.Path]::GetFullPath((Join-Path $PSScriptRoot '../..'))
+$expected='ff4dc1f7c9e1c64d4d69e40f4ed30c2280a96dfd'
+$actual=(& git -C $LlvmSourceRoot rev-parse HEAD).Trim()
+if ($LASTEXITCODE -or $actual -ne $expected) { throw "Expected audited ZLUDA LLVM source $expected, found $actual; review the patch against this revision." }
+$patches=@(Get-ChildItem (Join-Path $repo 'patches/zluda-llvm') -Filter *.patch | Sort-Object Name)
+foreach ($patch in $patches) {
+    $oldPreference=$ErrorActionPreference
+    try {
+        $ErrorActionPreference='Continue'
+        & git -C $LlvmSourceRoot apply --reverse --check $patch.FullName 2>$null
+        $applied=($LASTEXITCODE -eq 0)
+    } finally { $ErrorActionPreference=$oldPreference }
+    if (!$applied) {
+        & git -C $LlvmSourceRoot apply --check $patch.FullName
+        if ($LASTEXITCODE) { throw "LLVM source patch conflicts: $($patch.Name)" }
+        & git -C $LlvmSourceRoot apply $patch.FullName
+        if ($LASTEXITCODE) { throw "LLVM source patch failed: $($patch.Name)" }
+    }
+    Write-Host "LLVM source patch present: $($patch.Name)"
+}
+# The pinned backport is the entire intended LLVM delta.
+if ($patches.Count -ne 1) { throw 'Review combined LLVM source provenance before adding more patches.' }
+$audit=Join-Path $repo ('build/llvm-source-audit-'+[Guid]::NewGuid().ToString('N')+'.patch')
+New-Item -ItemType Directory -Force (Split-Path $audit) | Out-Null
+try {
+    & git -C $LlvmSourceRoot diff --binary --output=$audit
+    if ($LASTEXITCODE) { throw 'Cannot audit LLVM source diff.' }
+    $actualDiff=[IO.File]::ReadAllText($audit).Replace("`r`n","`n").TrimEnd()
+    $expectedDiff=[IO.File]::ReadAllText($patches[0].FullName).Replace("`r`n","`n").TrimEnd()
+    if ($actualDiff -cne $expectedDiff) { throw 'LLVM source contains changes outside the exported audited patch.' }
+} finally { if (Test-Path -LiteralPath $audit) { Remove-Item -LiteralPath $audit } }