Use the correct fxsave type for x86_64

snapshot/system_snapshot_mac.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 252 matching lines @@
   //
   // All CPUs that Apple is known to have shipped should support DAZ.
 
   // Test for fxsave support.
   uint64_t features = CPUX86Features();
   if (!(features & (UINT64_C(1) << 24))) {
     return false;
   }
 
   // Call fxsave.
+#if defined(ARCH_CPU_X86)
   CPUContextX86::Fxsave fxsave __attribute__((aligned(16))) = {};
+#elif defined(ARCH_CPU_X86_64)
+  CPUContextX86_64::Fxsave fxsave __attribute__((aligned(16))) = {};
+#endif
   static_assert(sizeof(fxsave) == 512, "fxsave size");
   static_assert(offsetof(decltype(fxsave), mxcsr_mask) == 28,
                 "mxcsr_mask offset");
   asm("fxsave %0" : "=m"(fxsave));
 
   // Test the DAZ bit.
   return fxsave.mxcsr_mask & (1 << 6);
 #else
   NOTREACHED();
   return false;
@@ skipping 102 matching lines @@
   } else {
     *daylight_name = tzname[0];
     *dst_status = kDoesNotObserveDaylightSavingTime;
     *standard_offset_seconds = local.tm_gmtoff;
     *daylight_offset_seconds = local.tm_gmtoff;
   }
 }
 
 }  // namespace internal
 }  // namespace crashpad