[flang][runtime] Fix octal input of REAL(10) #74658
Merged
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The overflow check didn't work for a 27-digit octal field containing an 80-bit x87 extended precision real value. The count of bytes required was too large because the leading digit (1) was assumed to require a full three bits. And the actual transmission of the octal input digits to the output buffer was incorrect, too.
Fixes llvm-test-suite/Fortran/gfortran/regression/boz_15.f90.