[LoongArch] Set isBarrier to true for instruction 'b' (#72339)

Instr "b offs26" represent to an unconditional branch in LoongArch. Set
isBarrier to 1 in tablegen for it, so that MCInstrAnalysis can

[LoongArch] Set isBarrier to true for instruction 'b' (#72339)

Instr "b offs26" represent to an unconditional branch in LoongArch. Set
isBarrier to 1 in tablegen for it, so that MCInstrAnalysis can return
correctly.

Fixes https://github.com/llvm/llvm-project/pull/71903.

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[LoongArch][NFC] Pre-commit MCInstrAnalysis tests for instruction 'b' (#71903)

The tests for 'b' which commented with FIXME are incorrect, the
following patch will fix it.

[LoongArch][MC] Refine MCInstrAnalysis based on registers used (#71276)

MCInstrAnalysis can return properties of instructions (e.g., isCall(),
isBranch(),...) based on the informations that MCInstr

[LoongArch][MC] Refine MCInstrAnalysis based on registers used (#71276)

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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