[flang] [llvm] [flang] implement `split` for fortran 2023 (PR #161484)

[Peter Klausler via llvm-commits]

================
@@ -570,6 +570,30 @@ static RT_API_ATTRS void MaxMin(Descriptor &accumulator, const Descriptor &x,
   }
 }
 
+template <typename CHAR>
+inline RT_API_ATTRS std::size_t Split(const CHAR *x, std::size_t xLen,
+    const CHAR *set, std::size_t setLen, std::size_t pos, bool back) {
----------------
klausler wrote:

`size_t` is the correct type to use for character lengths.  `int64_t` is the correct type to use for Fortran `INTEGER` values.

https://github.com/llvm/llvm-project/pull/161484