GCC has the alloc_align attribute, which is similar to assume_aligned, except the attribute's parameter is the index of the integer parameter that needs aligning to.

Differential Revision: https://reviews.llvm.org/D29599


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@299117 91177308-0d34-0410-b5e6-96231b3b80d8