UnitTests: Skip PageFaultTest if exception handlers are not supported

Page faults should only occur on architectures that support exception
handlers, so skip the test on other architectures to avoid spurious test
failures.

Source/Core/Core/MemTools.cpp

@@ -113,6 +113,11 @@ void UninstallExceptionHandler()
     s_veh_handle = nullptr;
 }
 
+bool IsExceptionHandlerSupported()
+{
+  return true;
+}
+
 #elif defined(__APPLE__) && !defined(USE_SIGACTION_ON_APPLE)
 
 static void CheckKR(const char* name, kern_return_t kr)
@@ -245,6 +250,11 @@ void UninstallExceptionHandler()
 {
 }
 
+bool IsExceptionHandlerSupported()
+{
+  return true;
+}
+
 #elif defined(_POSIX_VERSION) && !defined(_M_GENERIC)
 
 static struct sigaction old_sa_segv;
@@ -353,15 +363,27 @@ void UninstallExceptionHandler()
   sigaction(SIGBUS, &old_sa_bus, nullptr);
 #endif
 }
+
+bool IsExceptionHandlerSupported()
+{
+  return true;
+}
+
 #else  // _M_GENERIC or unsupported platform
 
 void InstallExceptionHandler()
 {
 }
+
 void UninstallExceptionHandler()
 {
 }
 
+bool IsExceptionHandlerSupported()
+{
+  return false;
+}
+
 #endif
 
 }  // namespace EMM

Source/Core/Core/MemTools.h

@@ -7,4 +7,5 @@ namespace EMM
 {
 void InstallExceptionHandler();
 void UninstallExceptionHandler();
+bool IsExceptionHandlerSupported();
 }  // namespace EMM

Source/UnitTests/Core/PageFaultTest.cpp

@@ -61,6 +61,11 @@ static void ASAN_DISABLE perform_invalid_access(void* data)
 
 TEST(PageFault, PageFault)
 {
+  if (!EMM::IsExceptionHandlerSupported())
+  {
+    // TODO: Use GTEST_SKIP() instead when GTest is updated to 1.10+
+    return;
+  }
   EMM::InstallExceptionHandler();
   void* data = Common::AllocateMemoryPages(PAGE_GRAN);
   EXPECT_NE(data, nullptr);