Build shared experimental sdk for x86 config

Author: mhegazy

.github/workflows/swift-toolchain.yml

@@ -2627,6 +2627,7 @@ jobs:
         with:
           name: ${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.static && 'static' || 'shared' }}-experimental-sdk
           path: ${{ github.workspace }}/BuildRoot/Library/Developer/Platforms/${{ matrix.os }}.platform
+                ${{ github.workspace }}/BuildRoot/Library/Developer/Platforms/${{ matrix.os }}.platform/Developer/SDKs/${{ matrix.os }}Experimental.sdk/usr
 
       - name: Upload PDBs to Azure
         if: matrix.os == 'Windows' && inputs.debug_info