Reviewed-by: tschatzl, jmasa

Reviewed-by: tschatzl, jmasa

Reviewed-by: tschatzl, jmasa, kvn, tamao

Summary: Added checking for gcc and simplified the sig_handler() in the test case
Reviewed-by: dcubed, coleenp, minqi, dlong

Summary: switch on TieredCompilation by default
Reviewed-by: twisti

Reviewed-by: acorn, jmasa, coleenp, dcubed, mgerdin

Reviewed-by: jcoomes