set BOOTSTRAP_SKIP_TARGET_SANITY in opt-dist before running tests

opt-dist overrides the stage 0 compiler with previously compiled compilers,
which can cause confusion in bootstrap's target sanity checks. It is best to
skip that check.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/tools/opt-dist/src/tests.rs

@@ -102,7 +102,13 @@ llvm-config = "{llvm_config}"
     for test_path in env.skipped_tests() {
         args.extend(["--skip", test_path]);
     }
-    cmd(&args).env("COMPILETEST_FORCE_STAGE0", "1").run().context("Cannot execute tests")
+    cmd(&args)
+        .env("COMPILETEST_FORCE_STAGE0", "1")
+        // Above we override the stage 0 compiler with previously compiled compiler,
+        // which can cause confusion in bootstrap's target sanity checks.
+        .env("BOOTSTRAP_SKIP_TARGET_SANITY", "1")
+        .run()
+        .context("Cannot execute tests")
 }
 
 /// Tries to find the version of the dist artifacts (either nightly, beta, or 1.XY.Z).