Fix build when both gtest death tests and LLVM_NODISCARD are available.

(matching r367495)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367899 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ADT/APIntTest.cpp

@@ -1390,15 +1390,15 @@ TEST(APIntTest, magicu) {
 #ifdef GTEST_HAS_DEATH_TEST
 #ifndef NDEBUG
 TEST(APIntTest, StringDeath) {
-  EXPECT_DEATH(APInt(0, "", 0), "Bitwidth too small");
-  EXPECT_DEATH(APInt(32, "", 0), "Invalid string length");
-  EXPECT_DEATH(APInt(32, "0", 0), "Radix should be 2, 8, 10, 16, or 36!");
-  EXPECT_DEATH(APInt(32, "", 10), "Invalid string length");
-  EXPECT_DEATH(APInt(32, "-", 10), "String is only a sign, needs a value.");
-  EXPECT_DEATH(APInt(1, "1234", 10), "Insufficient bit width");
-  EXPECT_DEATH(APInt(32, "\0", 10), "Invalid string length");
-  EXPECT_DEATH(APInt(32, StringRef("1\02", 3), 10), "Invalid character in digit string");
-  EXPECT_DEATH(APInt(32, "1L", 10), "Invalid character in digit string");
+  EXPECT_DEATH((void)APInt(0, "", 0), "Bitwidth too small");
+  EXPECT_DEATH((void)APInt(32, "", 0), "Invalid string length");
+  EXPECT_DEATH((void)APInt(32, "0", 0), "Radix should be 2, 8, 10, 16, or 36!");
+  EXPECT_DEATH((void)APInt(32, "", 10), "Invalid string length");
+  EXPECT_DEATH((void)APInt(32, "-", 10), "String is only a sign, needs a value.");
+  EXPECT_DEATH((void)APInt(1, "1234", 10), "Insufficient bit width");
+  EXPECT_DEATH((void)APInt(32, "\0", 10), "Invalid string length");
+  EXPECT_DEATH((void)APInt(32, StringRef("1\02", 3), 10), "Invalid character in digit string");
+  EXPECT_DEATH((void)APInt(32, "1L", 10), "Invalid character in digit string");
 }
 #endif
 #endif