adds a test for the user time

Author: feg208

lldb/unittests/Host/linux/HostTest.cpp

@@ -61,4 +61,14 @@ TEST_F(HostTest, GetProcessInfo) {
   EXPECT_TRUE(Info.GetArchitecture().IsValid());
   EXPECT_EQ(HostInfo::GetArchitecture(HostInfo::eArchKindDefault),
             Info.GetArchitecture());
+  // Test timings
+  ASSERT_TRUE(Host::GetProcessInfo(getpid(), Info));
+  ProcessInstanceInfo::timespec user_time = Info.GetUserTime();
+  for (unsigned i = 0; i < 10'000'000; i++) {
+    __asm__ __volatile__("" : "+g"(i) : :);
+  }
+  ASSERT_TRUE(Host::GetProcessInfo(getpid(), Info));
+  ProcessInstanceInfo::timespec next_user_time = Info.GetUserTime();
+  ASSERT_TRUE(user_time.tv_sec < next_user_time.tv_sec ||
+              user_time.tv_usec < next_user_time.tv_usec);
 }