[flang] Remove duplicate tests. (#77059)

Author: sihuan

flang/unittests/Runtime/ExternalIOTest.cpp

@@ -931,10 +931,6 @@ TEST(ExternalIOTests, BigUnitNumbers) {
         static_cast<std::int64_t>(std::numeric_limits<ExternalUnit>::min()) - 1;
     EXPECT_EQ(IONAME(CheckUnitNumberInRange64)(unit64Ok, true), IostatOk);
     EXPECT_EQ(IONAME(CheckUnitNumberInRange64)(unit64Ok, false), IostatOk);
-    EXPECT_EQ(
-        IONAME(CheckUnitNumberInRange64)(unit64Bad, true), IostatUnitOverflow);
-    EXPECT_EQ(
-        IONAME(CheckUnitNumberInRange64)(unit64Bad2, true), IostatUnitOverflow);
     EXPECT_EQ(
         IONAME(CheckUnitNumberInRange64)(unit64Bad, true), IostatUnitOverflow);
     EXPECT_EQ(
@@ -945,7 +941,7 @@ TEST(ExternalIOTests, BigUnitNumbers) {
     std::snprintf(expectedMsg, n, "UNIT number %jd is out of range",
         static_cast<std::intmax_t>(unit64Bad));
     EXPECT_DEATH(
-        IONAME(CheckUnitNumberInRange64)(2147483648, false), expectedMsg);
+        IONAME(CheckUnitNumberInRange64)(unit64Bad, false), expectedMsg);
     for (auto i{std::strlen(expectedMsg)}; i < n; ++i) {
       expectedMsg[i] = ' ';
     }