[base] Disable CFI_ICALL for OS::CreateSharedMemoryHandleForTesting

This is necessary due to the indirect call to memfd_create. The function
is only used for testing though.

Bug: v8:12682
Change-Id: Ifb9fd855213064165fa4c2125846ff592368b625
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3525534Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Auto-Submit: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79487}

src/base/platform/platform-posix.cc

@@ -578,6 +578,8 @@ void OS::FreeAddressSpaceReservation(AddressSpaceReservation reservation) {
 // macOS specific implementation in platform-macos.cc.
 #if !defined(V8_OS_MACOS)
 // static
+// Need to disable CFI_ICALL due to the indirect call to memfd_create.
+DISABLE_CFI_ICALL
 PlatformSharedMemoryHandle OS::CreateSharedMemoryHandleForTesting(size_t size) {
 #if V8_OS_LINUX && !V8_OS_ANDROID
   // Use memfd_create if available, otherwise mkstemp.