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[WebAssembly] More codegen for f64x2.convert_low_i32x4_{s,u}

Authored by tlively on Apr 20 2021, 12:37 PM.

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[WebAssembly] More codegen for f64x2.convert_low_i32x4_{s,u}

af7925b4dd65 added a custom DAG combine for recognizing fp-to-ints of
extract_subvectors that could be lowered to f64x2.convert_low_i32x4_{s,u}
instructions. This commit extends the combines to recognize equivalent
extract_subvectors of fp-to-ints as well.

Differential Revision: https://reviews.llvm.org/D100790

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