Verifier: Prefer early continue over if-nesting, NFC
Verifier: Prefer early continue over if-nesting, NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266897 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 8f2afa60b7b2185e00c0cb61e3bd1d603d18c289)

Conflicts:
	lib/IR/Verifier.cpp

Hit the same conflict as a couple of cherry-picks ago.  The only
difference is a range-based for loop.  This time I just took the trunk
version so we don't hit it again.

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm