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[ARM][AArch64] Introduce qrdmlah and qrdmlsh intrinsics
Since it's introduction, the qrdmlah has been represented as a qrdmulh and a sadd_sat. This doesn't produce the same result for all input values though. This patch fixes that by introducing a qrdmlah (and qrdmlsh) intrinsic specifically for the vqrdmlah and sqrdmlah instructions. The old test cases will now produce a qrdmulh and sqadd, as expected. Fixes #53120 and #50905 and #51761. Differential Revision: https://reviews.llvm.org/D117592
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