[lldb] Fix typo in CumulativeSystemTimeIsValid check (#89680)

Resolves #89674

GitOrigin-RevId: 266a9274dd14d06d559ca8a37e2d1b5f985a5398
diff --git a/include/lldb/Utility/ProcessInfo.h b/include/lldb/Utility/ProcessInfo.h
index e9fe71e..54ac000 100644
--- a/include/lldb/Utility/ProcessInfo.h
+++ b/include/lldb/Utility/ProcessInfo.h
@@ -234,7 +234,7 @@
 
   bool CumulativeSystemTimeIsValid() const {
     return m_cumulative_system_time.tv_sec > 0 ||
-           m_cumulative_system_time.tv_sec > 0;
+           m_cumulative_system_time.tv_usec > 0;
   }
 
   void Dump(Stream &s, UserIDResolver &resolver) const;
diff --git a/unittests/Host/HostTest.cpp b/unittests/Host/HostTest.cpp
index 5e01a68..a1d8a3b 100644
--- a/unittests/Host/HostTest.cpp
+++ b/unittests/Host/HostTest.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Host/Host.h"
+#include "lldb/Utility/ProcessInfo.h"
 #include "gtest/gtest.h"
 
 using namespace lldb_private;
@@ -25,3 +26,23 @@
   ASSERT_EQ("Host::GetEnvironment",
             Host::GetEnvironment().lookup("LLDB_TEST_ENVIRONMENT_VAR"));
 }
+
+TEST(Host, ProcessInstanceInfoCumulativeUserTimeIsValid) {
+  ProcessInstanceInfo info;
+  info.SetCumulativeUserTime(ProcessInstanceInfo::timespec{0, 0});
+  EXPECT_FALSE(info.CumulativeUserTimeIsValid());
+  info.SetCumulativeUserTime(ProcessInstanceInfo::timespec{0, 1});
+  EXPECT_TRUE(info.CumulativeUserTimeIsValid());
+  info.SetCumulativeUserTime(ProcessInstanceInfo::timespec{1, 0});
+  EXPECT_TRUE(info.CumulativeUserTimeIsValid());
+}
+
+TEST(Host, ProcessInstanceInfoCumulativeSystemTimeIsValid) {
+  ProcessInstanceInfo info;
+  info.SetCumulativeSystemTime(ProcessInstanceInfo::timespec{0, 0});
+  EXPECT_FALSE(info.CumulativeSystemTimeIsValid());
+  info.SetCumulativeSystemTime(ProcessInstanceInfo::timespec{0, 1});
+  EXPECT_TRUE(info.CumulativeSystemTimeIsValid());
+  info.SetCumulativeSystemTime(ProcessInstanceInfo::timespec{1, 0});
+  EXPECT_TRUE(info.CumulativeSystemTimeIsValid());
+}
\ No newline at end of file