MCInstrAnalysis can return properties of instructions (e.g., isCall(),
isBranch(),...) based on the informations that MCInstrDesc can get from
*InstrInfo*.td files. These infos are based on opcodes only, but JIRL
can have different properties based on different registers used.
So this patch refines several MCInstrAnalysis methods: isTerminator,
isCall,isReturn,isBranch,isUnconditionalBranch and isIndirectBranch.
This patch also allows BOLT which will be supported on LoongArch later
to get right instruction infos.
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