Rui Ueyama 00d4f49717 Return Error instead of bool from mergeTypeStreams().
Previously, mergeTypeStreams returns only true or false, so it was
impossible to know the reason if it failed. This patch changes the
function signature so that it returns an Error object.

Differential Revision: https://reviews.llvm.org/D29362

llvm-svn: 293820
2017-02-01 22:09:34 +00:00
..