[llvm] [ConstantFPRange] Suppress unused result warnings. NFC. (PR #109921)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-ir

Author: Yingwei Zheng (dtcxzyw)

<details>
<summary>Changes</summary>

Fixes warnings `error: ignoring return value of function declared with 'nodiscard' attribute [-Werror,-Wunused-result]`.


---
Full diff: https://github.com/llvm/llvm-project/pull/109921.diff


1 Files Affected:

- (modified) llvm/unittests/IR/ConstantFPRangeTest.cpp (+9-6) 


``````````diff
diff --git a/llvm/unittests/IR/ConstantFPRangeTest.cpp b/llvm/unittests/IR/ConstantFPRangeTest.cpp
index dbb6c4545a1831..bf6ea95c00e22e 100644
--- a/llvm/unittests/IR/ConstantFPRangeTest.cpp
+++ b/llvm/unittests/IR/ConstantFPRangeTest.cpp
@@ -414,18 +414,21 @@ TEST_F(ConstantFPRangeTest, Print) {
 #ifdef GTEST_HAS_DEATH_TEST
 #ifndef NDEBUG
 TEST_F(ConstantFPRangeTest, NonCanonicalEmptySet) {
-  EXPECT_DEATH(ConstantFPRange::getNonNaN(APFloat(1.0), APFloat(0.0)),
+  EXPECT_DEATH((void)(ConstantFPRange::getNonNaN(APFloat(1.0), APFloat(0.0))),
                "Non-canonical form");
 }
 TEST_F(ConstantFPRangeTest, MismatchedSemantics) {
-  EXPECT_DEATH(ConstantFPRange::getNonNaN(APFloat(0.0), APFloat(1.0f)),
+  EXPECT_DEATH((void)(ConstantFPRange::getNonNaN(APFloat(0.0), APFloat(1.0f))),
                "Should only use the same semantics");
-  EXPECT_DEATH(One.contains(APFloat(1.0f)),
+  EXPECT_DEATH((void)(One.contains(APFloat(1.0f))),
                "Should only use the same semantics");
   ConstantFPRange OneF32 = ConstantFPRange(APFloat(1.0f));
-  EXPECT_DEATH(One.contains(OneF32), "Should only use the same semantics");
-  EXPECT_DEATH(One.intersectWith(OneF32), "Should only use the same semantics");
-  EXPECT_DEATH(One.unionWith(OneF32), "Should only use the same semantics");
+  EXPECT_DEATH((void)(One.contains(OneF32)),
+               "Should only use the same semantics");
+  EXPECT_DEATH((void)(One.intersectWith(OneF32)),
+               "Should only use the same semantics");
+  EXPECT_DEATH((void)(One.unionWith(OneF32)),
+               "Should only use the same semantics");
 }
 #endif
 #endif

``````````

</details>


https://github.com/llvm/llvm-project/pull/109921