llvm-project

6e5e1c97 - [flang][flang-rt] Implement F202X leading-zero control edit descriptors LZ, LZS, and LZP for formatted output (F, E, D, and G editing) (#183500)

[flang][flang-rt] Implement F202X leading-zero control edit descriptors LZ, LZS, and LZP for formatted output (F, E, D, and G editing) (#183500) LZ: processor-dependent (default, flang prints leading zero); LZS: suppress the optional leading zero before the decimal point; LZP: print the optional leading zero before the decimal point. Changes span the source parser, compile-time format validator, runtime format processing, and runtime output formatting. Includes semantic test (io18.f90) and documentation updates.