cppgc: Fix iOS simulator build for stack scanning

Bug: v8:10369
Change-Id: I2590206bb8158fadeddc4235d36ce34dc91d7599
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2130270
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66930}

src/heap/cppgc/asm/x64/push_registers.S

@@ -6,19 +6,19 @@
 
 .text
 
-#ifdef V8_TARGET_OS_MACOSX
+#if defined(V8_TARGET_OS_MACOSX) || defined(V8_TARGET_OS_IOS)
 
 .globl _PushAllRegistersAndIterateStack
 _PushAllRegistersAndIterateStack:
 
-#else  // !V8_TARGET_OS_MACOSX
+#else  // !(defined(V8_TARGET_OS_MACOSX) || defined(V8_TARGET_OS_IOS))
 
 .type PushAllRegistersAndIterateStack, %function
 .global PushAllRegistersAndIterateStack
 .hidden PushAllRegistersAndIterateStack
 PushAllRegistersAndIterateStack:
 
-#endif  // !V8_TARGET_OS_MACOSX
+#endif  // !(defined(V8_TARGET_OS_MACOSX) || defined(V8_TARGET_OS_IOS))
 
     // Push all callee-saved registers to get them on the stack for conservative
     // stack scanning.