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ca33fd7987
If liveranges induced by an IMPLICIT_DEF get completely covered by a proper liverange the IMPLICIT_DEF instructions and its corresponding definitions have to be removed from the live ranges. This has to happen in the subregister live ranges as well (I didn't see this case earlier because in most programs only some subregisters are covered and the IMPLCIT_DEF won't get removed). No testcase, I spent hours trying to create one for one of the public targets, but ultimately failed because I couldn't manage to properly control the placement of COPY and IMPLICIT_DEF instructions from an .ll file. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233217 91177308-0d34-0410-b5e6-96231b3b80d8
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