[GlobalISel] Return an Expected<RuleMatcher> for each SDAG pattern. NFC.
Instead of emitting the matcher code directly, return the rule matcher
and the skip reason as an Expected<RuleMatcher>.
This will let us record all matchers and process them before emission.
It's a somewhat unconventional use of Error, but it's nicer than, say,
std::pair, because of the bool conversions.
Differential Revision: https://reviews.llvm.org/D29743
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294706 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed