[IR][REVEC] Define llvm.vector.broadcast intrinsic#208212
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This is used broadcast a smaller vector into a wider one. The patch adds basic legalisation support and ISel for AArch64.
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This is used broadcast a smaller vector into a wider one. The patch adds basic legalisation support and ISel for AArch64.
Note: This is part of a stacked PR to create a proof-of-concept for re-vectorisation in LoopVectorizer: