[clang] [flang] [flang] Add checks for Fortran 2023 system clock and add f2023/f202Y to valid arguments of -std= (PR #205938)

[via cfe-commits]

================
@@ -43,6 +43,13 @@ class LangOptionsBase {
     FPM_Fast,
   };
 
+  enum FortranStandardTy {
+    FortranUnspecified, // default
+    Fortran2018,
+    Fortran2023,
+    Fortran202Y,
----------------
mleair wrote:

f202Y is not a standard name. Please remove this. 

https://github.com/llvm/llvm-project/pull/205938
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