[Polly] Fix compiler warnings. NFC.

GitOrigin-RevId: 5a6d77065185cc3cb3e96affd7c96bc2854abd0d
diff --git a/unittests/Isl/IslTest.cpp b/unittests/Isl/IslTest.cpp
index a6def94..72c0a85 100644
--- a/unittests/Isl/IslTest.cpp
+++ b/unittests/Isl/IslTest.cpp
@@ -47,18 +47,10 @@
   return bool(LHS.is_equal(RHS));
 }
 
-static bool operator==(const isl::basic_set &LHS, const isl::basic_set &RHS) {
-  return bool(LHS.is_equal(RHS));
-}
-
 static bool operator==(const isl::set &LHS, const isl::set &RHS) {
   return bool(LHS.is_equal(RHS));
 }
 
-static bool operator==(const isl::basic_map &LHS, const isl::basic_map &RHS) {
-  return bool(LHS.is_equal(RHS));
-}
-
 static bool operator==(const isl::map &LHS, const isl::map &RHS) {
   return bool(LHS.is_equal(RHS));
 }
@@ -1142,9 +1134,9 @@
     EXPECT_TRUE(BoolResult.is_error());
     EXPECT_FALSE(BoolResult.is_false());
     EXPECT_FALSE(BoolResult.is_true());
-    EXPECT_DEATH((bool)BoolResult,
+    EXPECT_DEATH((void)(bool)BoolResult,
                  "IMPLEMENTATION ERROR: Unhandled error state");
-    EXPECT_DEATH((bool)!BoolResult,
+    EXPECT_DEATH((void)(bool)!BoolResult,
                  "IMPLEMENTATION ERROR: Unhandled error state");
     EXPECT_DEATH(
         {