[llvm] [IR] Add llvm `cmul` intrinsic (PR #140301)

[Craig Topper via llvm-commits]

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@@ -10471,8 +10471,8 @@ its two operands.
 
 .. note::
 
-	The instruction is implemented as a call to libm's '``fmod``'
-	for some targets, and using the instruction may thus require linking libm.
+    The instruction is implemented as a call to libm's '``fmod``'
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topperc wrote:

Unrelated formatting change

https://github.com/llvm/llvm-project/pull/140301