Add flags to tell compiler not to default to builtin malloc.
Add flags to tell compiler not to default to builtin malloc.

This makes sure that all places use tcmalloc.

Signed-off-by: Henner Zeller <259ad50fabbfd39355f36ecd6c0afca541ea66ef@acm.org>

alainmarcel/Surelog,chipsalliance/Surelog,chipsalliance/Surelog,alainmarcel/Surelog,chipsalliance/Surelog,chipsalliance/Surelog,alainmarcel/Surelog,alainmarcel/Surelog