[flang] [llvm] [flang] Implement SPLIT intrinsic subroutine with tests (PR #185584)

[via llvm-commits]

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@@ -39,7 +39,7 @@ status of all important Fortran 2023 features. The table entries are based on th
 | The specifiers typeof and classof                          | N      | |
 | Conditional expressions and arguments                      | N      | |
 | More use of boz constants                                  | P      | All usages other than enum are supported |
-| Intrinsics for extracting tokens from a string             | N      | |
+| Intrinsics for extracting tokens from a string             | Y      | SPLIT, TOKENIZE |
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laoshd wrote:

That make it clear that this feature includes two intrinsics. I can remove it if you insist.

https://github.com/llvm/llvm-project/pull/185584