[GlobalISel] Return an Expected<RuleMatcher> for each SDAG pattern. NFC.
[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: 0ff597fd157e6f4fc38580e8d64ab130330d2411@294706 91177308-0d34-0410-b5e6-96231b3b80d8

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