[Error] Add an optional error message to cantFail.
cantFail is the moral equivalent of an assertion that the wrapped call must
return a success value. This patch allows clients to include an associated
error message (the same way they would for an assertion for llvm_unreachable).
If the error message is not specified it will default to: "Failure value
returned from cantFail wrapped call".
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312066 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed