WIP: github: Only test building the macos toolchain, without PGO

Author: mstorsjo

.github/workflows/build.yml

@@ -128,6 +128,7 @@ jobs:
 
   # Build a cross compiler for Linux, targeting Windows.
   linux:
+    if: false
     needs: [prepare, linux-stage1, linux-profile]
     runs-on: ubuntu-22.04
     steps:
@@ -286,7 +287,7 @@ jobs:
 
   # Build a cross compiler for macOS, targeting Windows.
   macos:
-    needs: [prepare, macos-stage1, linux-profile]
+    needs: [prepare, macos-stage1]
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
@@ -298,9 +299,6 @@ jobs:
           tar -Jxf llvm-*.tar.xz
           rm llvm-*.tar.xz
           mv llvm* $HOME/llvm
-      - uses: actions/download-artifact@v4
-        with:
-          name: profile
       - name: Build
         env:
           LLVM_VERSION: ${{needs.prepare.outputs.LLVM_VERSION}}
@@ -314,7 +312,7 @@ jobs:
           # form. Therefore, autodetection will pick them up, but linking
           # universal binaries fails as those libraries are unavailable in the
           # other (x86_64) architecture form.
-          MACOS_REDIST=1 LLVM_CMAKEFLAGS="-DLLVM_ENABLE_ZSTD=OFF -DLLDB_ENABLE_PYTHON=OFF" ./build-all.sh $HOME/llvm $(pwd)/install/llvm-mingw --thinlto --pgo
+          MACOS_REDIST=1 LLVM_CMAKEFLAGS="-DLLVM_ENABLE_ZSTD=OFF -DLLDB_ENABLE_PYTHON=OFF" ./build-all.sh $HOME/llvm $(pwd)/install/llvm-mingw --thinlto
           .github/workflows/store-version.sh install/llvm-mingw/versions.txt
           ./test-libcxx-module.sh $(pwd)/install/llvm-mingw
           ./run-tests.sh $(pwd)/install/llvm-mingw
@@ -333,6 +331,7 @@ jobs:
   # environments). The binaries built here rely on the runtime libraries from
   # the host environment (libstdc++ or libc++).
   msys2:
+    if: false
     needs: [prepare]
     runs-on: windows-latest
     defaults: