Cherry-pick b6951b4. rdar://problem/108470299

    Unreviewed, suppress warning
    https://bugs.webkit.org/show_bug.cgi?id=255887
    rdar://108470299

    * Tools/TestWebKitAPI/Tests/WTF/bmalloc/IsoHeap.cpp:
    (TEST):

    Canonical link: https://commits.webkit.org/263332@main

Canonical link: https://commits.webkit.org/259548.704@safari-7615-branch

Tools/TestWebKitAPI/Tests/WTF/bmalloc/IsoHeap.cpp

@@ -302,7 +302,7 @@ TEST(bmalloc, ScavengedMemoryShouldBeReused)
         }
 
         // After that, allocating pointers in the upper tier.
-        for (unsigned i = 0; ;i++) {
+        for (;;) {
             void* ptr = heap.allocate();
             EXPECT_TRUE(ptr);
             ptrs.push_back(ptr);