Andrew Kelley b2a1b4c085 Sema: improve lowering of stores to bitcasted vector pointers ...

Detect if we are storing an array operand to a bitcasted vector pointer.
If so, we instead reach through the bitcasted pointer to the vector pointer,
bitcast the array operand to a vector, and then lower this as a store of
a vector value to a vector pointer. This generally results in better code,
as well as working around an LLVM bug.

See #11154

2022-03-14 00:11:46 -07:00

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