[llvm] [Hexagon] Add missing patterns to select PFALSE and PTRUE (PR #138712)

[via llvm-commits]

llvmbot wrote:

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Failed to cherry-pick: [194a4a3](https://github.com/llvm/llvm-project/commit/194a4a333a95f9e001d2c8abe82c3d4cf8894acf)

https://github.com/llvm/llvm-project/actions/runs/15060425251

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/138712