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We don't have enough GR64_TC registers when calling a varargs function with 6 arguments. Since %al holds the number of vector registers used, only %r11 is available as a scratch register. This means that addressing modes using both base and index registers can't be folded into TCRETURNmi64. <rdar://problem/12282281> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163761 91177308-0d34-0410-b5e6-96231b3b80d8