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c9978bab4b
Disallow all mutation of `MCSubtargetInfo` expect the feature bits. Besides deleting the assignment operators -- which were dead "code" -- this restricts `InitMCProcessorInfo()` to subclass initialization sequences, and exposes a new more limited function called `setDefaultFeatures()` for use by the ARMAsmParser `.cpu` directive. There's a small functional change here: ARMAsmParser used to adjust `MCSubtargetInfo::CPUSchedModel` as a side effect of calling `InitMCProcessorInfo()`, but I've removed that suspicious behaviour. Since the AsmParser shouldn't be doing any scheduling, there shouldn't be any observable change... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241961 91177308-0d34-0410-b5e6-96231b3b80d8
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