Dylan McKay b967d16c43 [AVR] Update the data layout ...

The previous data layout caused issues when dealing with atomics.

Foe example, it is illegal to load a 16-bit value with less than 16-bits
of alignment.

This changes the data layout so that all types are aligned by at least
their own width.

Interestingly, this also _slightly_ decreased register pressure in some
cases.

llvm-svn: 282587

2016-09-28 13:29:10 +00:00

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