X87: [wasm] Int64Lowering of Int64Add on ia32 and arm.
port 1b230799 (r34747) original commit message: Int64Add is lowered to a new turbofan operator, Int32AddPair. The new operator takes 4 inputs an generates 2 outputs. The inputs are the low word of the left input, high word of the left input, the low word of the right input, and high word of the right input. The ouputs are the low and high word of the result of the addition. BUG= Review URL: https://codereview.chromium.org/1806833002 Cr-Commit-Position: refs/heads/master@{#34803}
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