[llvm] [LangRef] Clarify the `nsz` semantic for `{u, s}itofp` (PR #201557)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-ir

Author: paperchalice

<details>
<summary>Changes</summary>

`nsz` has special semantic in `{u,s}itofp`, which falls into the "unless otherwise mentioned" in `nsz` doc, this PR clarifies it in LangRef. 

---
Full diff: https://github.com/llvm/llvm-project/pull/201557.diff


1 Files Affected:

- (modified) llvm/docs/LangRef.rst (+6) 


``````````diff
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 4bc684c23ea4f..83c07f16e6a29 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -13145,6 +13145,9 @@ the default rounding mode.
 If the ``nneg`` flag is set, and the ``uitofp`` argument is negative,
 the result is a poison value.
 
+if the '``nsz``' flag is set and the input value is 0, the sign bit of
+the result is non-deterministic.
+
 
 Example:
 """"""""
@@ -13192,6 +13195,9 @@ quantity and converts it to the corresponding floating-point value. If the
 value cannot be exactly represented, it is rounded using the default rounding
 mode.
 
+if the '``nsz``' flag is set and the input value is 0, the sign bit of
+the result is non-deterministic.
+
 Example:
 """"""""
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/201557