Fix MachineInstr::findRegisterUseOperandIdx subreg checks
The function only checks that instruction reads a super-register
containing requested physical register. In case if a sub-register
if being read that is also a use of a super-reg, so added the check.
In particular MI->readsRegister() is broken because of the missing
check. The resulting check is essentially regsOverlap().
Differential Revision: https://reviews.llvm.org/D54128
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346686
91177308-0d34-0410-b5e6-
96231b3b80d8
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