WebAssembly: use trap to detect invalid index in call_indirect 
https://bugs.webkit.org/show_bug.cgi?id=177210
Summary WebAssembly: use trap to detect invalid index in call_indirect
JF Bastien
Reported 2017-09-19 16:59:36 PDT
Signature::invalidIndex is zero, so if we have trap handlers B3IRGenerator::addCallIndirect doesn't need to do an explicit check.
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