[wasm] Int64Lowering of Word64Popcnt.
Word64Popcnt is lowered to Word32Popcnt(low-word) + Word32Popcnt(high_word). Since the optional Word64Popcnt operator does not exist on 32 bit platforms, I introduced a new operator "Word64PopcntPlaceholder" which is generated in the WasmCompiler and then lowered in the Int64Lowering. R=titzer@chromium.org Review URL: https://codereview.chromium.org/1803453003 Cr-Commit-Position: refs/heads/master@{#34777}
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