The WebAssembly backend needs to know the signatures of all runtime
libcall functions. This adds the signature for __stack_chk_fail which was
previously missing.
Also, make the error message for a missing libcall include the name of
the function.
Differential Revision: https://reviews.llvm.org/D59521
Reviewed By: sbc100
llvm-svn: 359505
Dan Gohman