[wasm] OOB traps: build protected instruction list during codegen
During codegen, we build a list mapping protected instructions to their associated landing pads. This will ultimately by used by the signal handler to recover from out of bounds faults and throw a JS exception. This is mostly pulled from my larger in-progress CL at https://codereview.chromium.org/2371833007/. BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277 Review-Url: https://codereview.chromium.org/2500443004 Cr-Commit-Position: refs/heads/master@{#41400}
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