[llvm] [ConstantRange][LVI] Add initial support for `multiplyWithNoWrap` (PR #92356)

[Nikita Popov via llvm-commits]

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@@ -1019,18 +1023,102 @@ TEST_F(ConstantRangeTest, Multiply) {
       });
 }
 
+TEST_F(ConstantRangeTest, MultiplyWithNoWrap) {
+  using OBO = OverflowingBinaryOperator;
+
+  EXPECT_EQ(Empty.multiplyWithNoWrap(Some, OBO::NoUnsignedWrap), Empty);
+  EXPECT_EQ(Some.multiplyWithNoWrap(Empty, OBO::NoUnsignedWrap), Empty);
+  EXPECT_EQ(Full.multiplyWithNoWrap(Full, OBO::NoUnsignedWrap), Full);
+  EXPECT_EQ(Full.multiplyWithNoWrap(Some, OBO::NoUnsignedWrap), Full);
+  EXPECT_EQ(Some.multiplyWithNoWrap(Full, OBO::NoUnsignedWrap), Full);
+  EXPECT_EQ(ConstantRange(APInt(4, 0), APInt(4, 2))
+                .multiplyWithNoWrap(ConstantRange(APInt(4, 2), APInt(4, 0)),
+                                    OBO::NoUnsignedWrap),
+            ConstantRange(4, true));
----------------
nikic wrote:

```suggestion
            ConstantRange::getFull(4));
```

https://github.com/llvm/llvm-project/pull/92356