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Without this change, when the estimated cost for inlining a function with an "alwaysinline" attribute was lower than the inlining threshold, the getInlineCost function was returning that estimated cost rather than the special InlineCost::AlwaysInlineCost value. That is fine in the normal inlining case, but it can fail when the inliner considers the opportunity cost of inlining into an internal or linkonce-odr function. It may decide not to inline the always-inline function in that case. The fix here is just to make getInlineCost always return the special value for always-inline functions. I ran into this building clang with libc++. Tablegen failed to link because of an always-inline function that was not inlined. I have been unable to reduce the testcase down to a reasonable size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165367 91177308-0d34-0410-b5e6-96231b3b80d8
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