Daniel Cederman c10b175ddb Avoid losing Hi part when expanding VAARG nodes on big endian machines
Summary:
If the high part of the load is not used the offset to the next element
will not be set correctly.

For example, on Sparc V8, the following code will read val2 from offset 4
instead of 8.

```
int val = __builtin_va_arg(va, long long);
int val2 = __builtin_va_arg(va, int);
```

Reviewers: jyknight

Reviewed By: jyknight

Subscribers: fedor.sergeev, jrtc27, llvm-commits

Differential Revision: https://reviews.llvm.org/D48595

llvm-svn: 337161
2018-07-16 12:14:17 +00:00

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