Update unit test API usage (NFC)
diff --git a/lldb/unittests/Platform/PlatformAppleSimulatorTest.cpp b/lldb/unittests/Platform/PlatformAppleSimulatorTest.cpp
index 42549e8..87c30de 100644
--- a/lldb/unittests/Platform/PlatformAppleSimulatorTest.cpp
+++ b/lldb/unittests/Platform/PlatformAppleSimulatorTest.cpp
@@ -30,10 +30,7 @@
   ASSERT_TRUE(platform_sp);
   int num_arches = 0;
 
-  while (true) {
-    ArchSpec arch;
-    if (!platform_sp->GetSupportedArchitectureAtIndex(num_arches, arch))
-      break;
+  for (auto arch : platform_sp->GetSupportedArchitectures()) {
     EXPECT_EQ(arch.GetTriple().getEnvironment(), llvm::Triple::Simulator);
     num_arches++;
   }