[SPIR-V] Support optimization of branching with analyzeBranch/removeBranch/insertBranch functions (#110653) This PR fixes implementation of `SPIRVInstrInfo::analyzeBranch()` and adds implementations of `SPIRVInstrInfo::removeBranch()` and `SPIRVInstrInfo::insertBranch()` to support Branch Folding and If Conversion optimization. The attached test case failed before this PR due to report_fatal_error() firing on missing implementation of `SPIRVInstrInfo::removeBranch()`. The new test case is not able to pass spirv-val check at the moment due to the issue described in https://github.com/llvm/llvm-project/issues/110652 , this is not related to this PR. This PR also updates instructions definition in tablegen to set isBranch=1 for relevant instructions.
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