[Support] Remove stale comment
authorShoaib Meenai <smeenai@fb.com>
Tue, 26 May 2020 19:22:03 +0000 (12:22 -0700)
committerShoaib Meenai <smeenai@fb.com>
Tue, 26 May 2020 19:22:03 +0000 (12:22 -0700)
commite99d50d8440efe8fa3515db4dae873ba39810dfd
treecfa8830de2af140a12ba8d419b89cad964d20292
parente09064e97f293491e59b30569033c8962129bdeb
[Support] Remove stale comment

Clang has supported __builtin_assume_aligned since r217349 back in 2014,
so the comment is very out of date.
llvm/include/llvm/Support/Compiler.h