[llvm] [NVPTX] Implemented istruncatefree and iszextfree alongwith test cases. (PR #115139)

[Justin Fargnoli via llvm-commits]

================
@@ -0,0 +1,54 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
----------------
justinfargnoli wrote:

I am happy to see that you were able to autogenerate the tests! That's something that I struggled with initially. 

https://github.com/llvm/llvm-project/pull/115139