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[AArch64][SVE] Allow C-style casts between fixed-size and scalable vectors

Authored by joechrisellis on Nov 17 2020, 4:33 AM.

Description

[AArch64][SVE] Allow C-style casts between fixed-size and scalable vectors

This patch allows C-style casting between fixed-size and scalable
vectors. This kind of cast was previously blocked by the compiler, but
it should be allowed.

Differential Revision: https://reviews.llvm.org/D91262