Line "BLR to Source mapping:" may look broken when procedures.rdb$debug_info is queried using remote protocol

[pavel-zotov]

Consider script from attached .zip
gh-8579_-_make-nested-subroutines.sql.zip

Note: database creation / connect must use remote protocol.

On Windows and Linux its output has following tail:

Sub procedure SP_MAIN_SUB_PROC_00017:

Variables:
    Number Name
---------------------------------------
         0 N

BLR to Source mapping:
BLR offset       Line     Column
--------------------------------
        14        164          1
        21        165          1
        23        166          1


Sub procedure SP_MAIN_SUB_PROC_00018:

Variables:
    Number Name
---------------------------------------
         0 N

BLR to Source m
apping:
BLR offset       Line     Column
--------------------------------
        14        169          1
        21        170          1
        23        171          1

=======================================

(i.e. line "BLR to Source mapping:" is broken for sub_proc00018).

No such problem if we try to use only nested functions (instead of SPs) or just nested procedures (without functions).