Description of problem:
trying to compile ffpmeg with gcc 8.3.1 as of cauldron results in a segfault of the compiler when the default optimization level is used (-O3)
reducing to -O2 works as a workaround and doesn't trigger the bug.

Version-Release number of selected component (if applicable):
gcc (Mageia 8.3.1-0.20190503.1.mga7) 8.3.1 20190503

How reproducible:
100%

Steps to Reproduce:
1. extract the attached reduced testcase and cd to it
   $ tar -xf repro.tar.bz2
   $ cd repro
2. try to compile using -O3 using:
   $ LC_MESSAGES=C gcc -I. -O3 -c -o /tmp/rle.o rle.c
during GIMPLE pass: dom
rle.c: In function ‘ff_rle_count_pixels’:
rle.c:26:5: internal compiler error: Segmentation fault
 int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same)
     ^~~~~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.mageia.org/> for instructions.

3. try the same thing using just -O2 → works
   $ LC_MESSAGES=C gcc -I. -O2 -c -o /tmp/rle.o rle.c
   $ echo $?
0