Revert "[CodeGenPrepare] Scan past debug intrinsics to find select candidates (NFC)"
Revert "[CodeGenPrepare] Scan past debug intrinsics to find select candidates (NFC)"

This causes crashes due to the interleaved dbg.value intrinsics being
left at the end of basic blocks, causing the actual terminators (br,
etc) to be not where they should be (not at the end of the block),
leading to later crashes.

Further discussion on the original commit thread.

This reverts commit r340368.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@340794 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 237dc6a794d107d2e19bfb28e2b5fca730622c18)

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