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[WebAssembly] Emit br_table for most switch instructions
Summary: Always convert switches to br_tables unless there is only one case, which is equivalent to a simple branch. This reduces code size for wasm, and we defer possible jump table optimizations to the VM. Addresses PR41502. Reviewers: kripken, sunfish Subscribers: dschuff, sbc100, jgravelle-google, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D60966 llvm-svn: 359038
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