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PEI inserts a save/restore sequence for the link register, according to the information it gets from the MachineRegisterInfo. MachineRegisterInfo is populated by the VirtRegMap pass. This pass was not aware of noreturn calls and was registering the definitions of these calls the same way as regular operations. Modify VirtRegPass so that it does not set the isPhysRegUsed information for registers only defined by noreturn calls. The rational is that a noreturn call is the "last instruction" of the program (if it returns the behavior is undefined), so everything that is defined by it cannot be used and will not interfere with anything else. Therefore, it is pointless to account for then. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191349 91177308-0d34-0410-b5e6-96231b3b80d8
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