[llvm] [NFC][LLVM] Remove unused `TargetIntrinsicInfo` class (PR #126003)

[Matt Arsenault via llvm-commits]

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@@ -61,6 +61,8 @@ Changes to the LLVM IR
 Changes to LLVM infrastructure
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+* The `TargetIntrinsicInfo` support has been removed.
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arsenm wrote:

Note sounds ambiguous to the unfamiliar 

https://github.com/llvm/llvm-project/pull/126003