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The goal of the patch is to implement section 3.2.3 of the AMD64 ABI correctly. The controlling sentence is, "The size of each argument gets rounded up to eightbytes. Therefore the stack will always be eightbyte aligned." The equivalent sentence in the i386 ABI page 37 says, "At all times, the stack pointer should point to a word-aligned area." For both architectures, the stack pointer is not being rounded up to the nearest eightbyte or word between the last normal argument and the first variadic argument. Patch by Thomas Jablin! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216119 91177308-0d34-0410-b5e6-96231b3b80d8
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