chore: Update alpha-build.sh script to handle xvfb-run not found, enable LTO only when not cross-compiling, and set LLVM_PROFDATA environment variable

.github/workflows/alpha.yml

@@ -288,7 +288,6 @@ jobs:
           sudo apt install -y msitools python3-pip
           ./mach python --virtualenv build taskcluster/scripts/misc/get_vs.py build/vs/vs2022.yaml ~/win-cross/vs2022
           
-          chmod -R +x "$(echo ~)/win-cross/vs2022" || true
  
           cat ../.github/workflows/src/windows_mozconfig >> ../configs/common/mozconfig
 
@@ -303,7 +302,6 @@ jobs:
           cat ../configs/common/mozconfig
 
           ls ~/win-cross/wine || true
-          ls ~/win-cross/vs2022 || true
   
       - name: setup Rust 
         run: |
@@ -322,6 +320,14 @@ jobs:
       - name: Import
         run: pnpm surfer import --verbose  
 
+      - name: Setup vs2022 and PGO
+        run: |
+          cd engine/
+          export GEN_PGO=1
+          ./mach python --virtualenv build ./taskcluster/scripts/misc/get_vs.py build/vs/vs2022.yaml $HOME/win-cross
+          ls ~/win-cross/vs2022 || true
+          chmod -R +x "$(echo ~)/win-cross/vs2022" || true
+
       - name: Build
         run: |
           unset SURFER_PLATFORM

.github/workflows/src/alpha-build.sh

@@ -6,6 +6,7 @@ then
   echo "xvfb-run could not be found, running without it"
   pnpm build
 else
+  export LLVM_PROFDATA=$HOME/.mozbuild/clang/bin/llvm-profdata
   export DISPLAY=:2
   xvfb-run -s "-screen 0 1920x1080x24 -nolisten local" pnpm build
 fi

.github/workflows/src/windows_mozconfig

@@ -21,6 +21,8 @@ export MOZ_INCLUDE_SOURCE_INFO=1
 export MOZ_STUB_INSTALLER=1
 export WINEDEBUG=-all
 export WINE="$TOOLS/wine/bin/wine64"
+export WIN32_REDIST_DIR="$TOOLS"/VC/Redist/MSVC/14.34.31931/x64/Microsoft.VC143.CRT
+export WIN_UCRT_REDIST_DIR="$TOOLS/Windows Kits/10/Redist/10.0.22621.0/ucrt/DLLs/x64"
 
 export RUSTFLAGS="$RUSTFLAGS -Ctarget-cpu=x86-64"