Run PROCESS isolated tests in 32-bit (#683)

Author: slozier

Build/steps.yml

@@ -86,7 +86,7 @@ steps:
 
     # 32-bit tests on Windows only
   - ${{ if eq(parameters.os, 'Windows') }}:
-    - powershell: ./make.ps1 -platform x86 test-all
+    - powershell: ./make.ps1 -frameworks net45 -platform x86 test-all
       displayName: Test 32-bit
 
   - task: PublishTestResults@2

Src/IronPythonTest/Cases/CaseExecuter.cs

@@ -39,11 +39,14 @@ private static string Executable {
                     if (File.Exists(runner)) return runner;
                 }
 #else
+                if (Environment.Is64BitOperatingSystem && IntPtr.Size == 4) {
+                    runner = Path.Combine(folder, "ipy32.exe");
+                    if (File.Exists(runner)) return runner;
+                }
                 runner = Path.Combine(folder, "ipy.exe");
                 if (File.Exists(runner)) return runner;
 #endif
                 throw new FileNotFoundException();
-
             }
         }