Attempt to unbreak buidlbot lld-x86_64-darwin13 after r342555.
The reason why build #25777 might have failed is because the SmallVector move
constructor is _not_ noexcept, and the stl implementation used by that buildbot
calls _VSTD::move_if_noexcept() (according to the backtrace).
OpcodeInfo has a default move constructor, and the copy constructor is deleted.
However, as far as I can see, SmallVector doesn't declare a noexcept move
constructor. So, what I believe it is happening here is that,
_VSTD::move_if_noexcept() returns an lvalue reference and not an rvalue
reference.
This eventually triggers a copy that fails to compile.
Hopefully, using a std::vector instead of SmallVector (as it was originally
suggested by Simon in the code review) should be enough to unbreak the buildbot.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342561
91177308-0d34-0410-b5e6-
96231b3b80d8
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