[nci] Fix compilation error on PPC and MIPS64

Currently the compilation may fail with the following error:

loop will run at most once (loop increment never executed)

Change-Id: I79dd1c5212475647c42e803858fe589cd9a05b7e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2294916Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#68823}

src/objects/code.cc

@@ -255,10 +255,13 @@ bool Code::IsIsolateIndependent(Isolate* isolate) {
                  RelocInfo::ModeMask(RelocInfo::WASM_CALL) |
                  RelocInfo::ModeMask(RelocInfo::WASM_STUB_CALL)));
 
-  for (RelocIterator it(*this, kModeMask); !it.done(); it.next()) {
-#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_ARM64) || \
-    defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS) ||  \
+#if defined(V8_TARGET_ARCH_PPC) || defined(V8_TARGET_ARCH_PPC64) || \
+    defined(V8_TARGET_ARCH_MIPS64)
+  return RelocIterator(*this, kModeMask).done();
+#elif defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_ARM64) || \
+    defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS) ||    \
     defined(V8_TARGET_ARCH_S390) || defined(V8_TARGET_ARCH_IA32)
+  for (RelocIterator it(*this, kModeMask); !it.done(); it.next()) {
     // On these platforms we emit relative builtin-to-builtin
     // jumps for isolate independent builtins in the snapshot. They are later
     // rewritten as pc-relative jumps to the off-heap instruction stream and are
@@ -271,10 +274,11 @@ bool Code::IsIsolateIndependent(Isolate* isolate) {
       CHECK(target.IsCode());
       if (Builtins::IsIsolateIndependentBuiltin(target)) continue;
     }
-#endif
     return false;
   }
-
+#else
+#error Unsupported architecture.
+#endif
   return true;
 }