x86_64 ABI: Fix thinko in computation of bound for "passed in SSE regs" test.

Two more gcc/x86_64 failures down.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64963 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed