AArch64: __va_list.__stack must be 8-byte aligned

[Oliver Stannard]

Hi all,

 

The attached patch fixes an issue where the __stack pointer in a va_list
struct was not rounded up to a multiple of 8 bytes by va_start. This
resulted in reading anonymous arguments from the wrong stack offset when the
last named argument was a struct which was not a multiple of 8 bytes, and
allocated on the stack.

 

Oliver
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