[llvm] [C API] Add function to create constantRange attributes to C API (PR #90505)

[Nikita Popov via llvm-commits]

================
@@ -673,6 +673,18 @@ LLVMAttributeRef LLVMCreateTypeAttribute(LLVMContextRef C, unsigned KindID,
  */
 LLVMTypeRef LLVMGetTypeAttributeValue(LLVMAttributeRef A);
 
+/**
+ * Create a ConstantRange attribute.
+ *
+ * LowerWords and UpperWords needs to be NumBits divided by 64 rounded up
----------------
nikic wrote:

```suggestion
 * LowerWords and UpperWords need to be NumBits divided by 64 rounded up
```

https://github.com/llvm/llvm-project/pull/90505