Make the DataLayout string always hold a vector alignment of 8 bytes,
regardless of the vector ABI. This makes the datalayout depend only on the
target triple which is the general expectation (in assertions).
On older architectures where vectors use the natural alignment (16 bytes),
the front end will maintain the same behavior and produce an overalignment
compared to the datalayout.
Reviewed By: uweigand
Differential Revision: https://reviews.llvm.org/D131158
Each function is with this compiled with the SystemZSubtarget initialized
from the functions attributes.
Review: Ulrich Weigand.
Differential Revision: https://reviews.llvm.org/D74086
Jonas Paulsson