Disable tail calls inside Simple GM functions.

I haven't found any way to turn off the particular optimization (-foptimize-sibling-calls)
per-function, but I can control optimization settings coarsely:

   - on GCC, we can pick a particular -O level, so I've picked -O1 which does not
     enable -foptimize-sibling-calls
   - on Clang, we can only disable all optimization for a function
   - have no idea about MSVC

This should make sure the simple GM functions, e.g. all_bitmap_configs_GM(),
show up on stack traces when we crash.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2050473006

Review-Url: https://codereview.chromium.org/2050473006
1 file changed