Description of problem:
The latest update of gcc-9 creted issues when generating code coverage for unit tests.


Version-Release number of selected component (if applicable):
sh$ rpm -q gcc lcov
gcc-9.0.0-0.4.fc30.x86_64
lcov-1.13-5.fc29.noarch

How reproducible:
Deterministic

Steps to Reproduce:
1. echo "const int a = 5; int main(void) { return 1;}" > t.c
2. gcc -Wall -Wextra -Werror ./t.c --coverage
3. lcov -t "result" -o ex_test.info -c -d .
4. lcov -l ex_test.info

Actual results:
[build@5c6865f4371e tmp]$ echo "const int a = 5; int main(void) { return 1;}" > t.c
[build@5c6865f4371e tmp]$ gcc -Wall -Wextra -Werror ./t.c --coverage
[build@5c6865f4371e tmp]$ ./a.out 
[build@5c6865f4371e tmp]$ lcov -t "result" -o ex_test.info -c -d .
Capturing coverage data from .
Found gcov version: 9.0.0
Scanning . for .gcda files ...
Found 1 data files in .
Processing t.gcda
geninfo: WARNING: /tmp/t.gcno: Overlong record at end of file!
geninfo: WARNING: gcov did not create any files for /tmp/t.gcda!
Finished .info-file creation
[build@5c6865f4371e tmp]$ lcov -l ex_test.info
Reading tracefile ex_test.info
lcov: ERROR: no valid records found in tracefile ex_test.info


Expected results:
//the same output as with gcc-8
$ echo "const int a = 5; int main(void) { return 1;}" > t.c
$ gcc -Wall -Wextra -Werror ./t.c --coverage
$ ./a.out
$ lcov -t "result" -o ex_test.info -c -d .
Capturing coverage data from .
Found gcov version: 8.2.1
Scanning . for .gcda files ...
Found 1 data files in .
Processing t.gcda
Finished .info-file creation
$ lcov -l ex_test.info
Reading tracefile ex_test.info
            |Lines       |Functions  |Branches    
Filename    |Rate     Num|Rate    Num|Rate     Num
==================================================
[/tmp/data/gcov/]
t.c         | 100%      1| 100%     1|    -      0
==================================================
      Total:| 100%      1| 100%     1|    -      0

Additional info:
// Content of files. Maybe it will be useful for debugging

[build@5c6865f4371e tmp]$ ls
 a.out   ex_test.info   'pL'$'\257'   t.c   t.gcda   t.gcno
[build@5c6865f4371e tmp]$ cat 'pL'$'\257'
        -:    0:Source:t.c
        -:    0:Graph:/tmp/t.gcno
        -:    0:Data:/tmp/t.gcda
        -:    0:Runs:1
function main called 1 returned 100% blocks executed 100%
        1:    1:const int a = 5; int main(void) { return 1;}
[build@5c6865f4371e tmp]$ hexdump -C t.gcda
00000000  61 64 63 67 52 30 39 41  bf ae a7 7b 00 00 00 a1  |adcgR09A...{....|
00000010  02 00 00 00 01 00 00 00  01 00 00 00 00 00 00 01  |................|
00000020  03 00 00 00 eb 72 70 06  78 b3 57 c3 e8 e9 5d db  |.....rp.x.W...].|
00000030  00 00 a1 01 02 00 00 00  01 00 00 00 00 00 00 00  |................|
00000040  00 00 00 00                                       |....|
00000044
[build@5c6865f4371e tmp]$ hexdump -C t.gcno 
00000000  6f 6e 63 67 52 30 39 41  bf ae a7 7b 02 00 00 00  |oncgR09A...{....|
00000010  2f 74 6d 70 00 00 00 00  01 00 00 00 00 00 00 01  |/tmp............|
00000020  0d 00 00 00 eb 72 70 06  78 b3 57 c3 e8 e9 5d db  |.....rp.x.W...].|
00000030  02 00 00 00 6d 61 69 6e  00 00 00 00 00 00 00 00  |....main........|
00000040  02 00 00 00 2e 2f 74 2e  63 00 00 00 01 00 00 00  |...../t.c.......|
00000050  16 00 00 00 01 00 00 00  00 00 41 01 01 00 00 00  |..........A.....|
00000060  04 00 00 00 00 00 43 01  03 00 00 00 00 00 00 00  |......C.........|
00000070  02 00 00 00 04 00 00 00  00 00 43 01 03 00 00 00  |..........C.....|
00000080  02 00 00 00 03 00 00 00  05 00 00 00 00 00 43 01  |..............C.|
00000090  03 00 00 00 03 00 00 00  01 00 00 00 01 00 00 00  |................|
000000a0  00 00 45 01 08 00 00 00  02 00 00 00 00 00 00 00  |..E.............|
000000b0  02 00 00 00 2e 2f 74 2e  63 00 00 00 01 00 00 00  |...../t.c.......|
000000c0  00 00 00 00 00 00 00 00                           |........|
000000c8