Shubham Sandeep Rastogi
0935e1510d
Return nullopt if Reg is undef. ( #155893 )
...
In describeORRLoadedValue in AArch64InstrInfo.cpp, we try to check if an
instruction is a copy like instruction, the isCopyLikeInstr function
returns a pair of destination and source registers. If any of them are
undef, we should just return a nullopt to avoid any crashes later in the
code when trying to get the SubReg for one of those registers.
rdar://158581204
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..
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