PR# 16414 Wrong line numbers reported for C compilation failure with line_generation enabled

A C compilation failure with line_generation enabled in the configuration file produces some
wrong line numbers (or maybe I am just very confused).  Example below.

Freeze and C compile with attached class and config file.  Output from
finish_freezing is:

Preparing C compilation
Compiling C code in C1
"te704.c", line 14: syntax error before or at: )
"te704.c", line 14: warning: syntax error:  empty declaration
"/marten/test/classes/test.e", line 39: syntax error before or at: )
"/marten/test/classes/test.e", line 51: cannot recover from previous errors
cc: acomp failed for big_file_C1_c.c

Or perhaps line_generation is just broken.

There is no line 39 in class TEST (it only has 16 lines).  It seems that line 39
and line 51 refer to the C file te704.c.  If that file was mentioned on the
lines that list "/marten/test/classes/test.e", perhaps with the latter in
parentheses, then it wouldn't be so confusing.

Attachments for problem report #16414