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Summary: Under option -mergefunc-preserve-debug-info we: - Do not create a new function for a thunk. - Retain the debug info for a thunk's parameters (and associated instructions for the debug info) from the entry block. Note: -debug will display the algorithm at work. - Create debug-info for the call (to the shared implementation) made by a thunk and its return value. - Erase the rest of the function, retaining the (minimally sized) entry block to create a thunk. - Preserve a thunk's call site to point to the thunk even when both occur within the same translation unit, to aid debugability. Note that this behaviour differs from the underlying -mergefunc implementation which modifies the thunk's call site to point to the shared implementation when both occur within the same translation unit. Reviewers: echristo, eeckstein, dblaikie, aprantl, friss Reviewed By: aprantl Subscribers: davide, fhahn, jfb, mehdi_amini, llvm-commits Differential Revision: https://reviews.llvm.org/D28075 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292702 91177308-0d34-0410-b5e6-96231b3b80d8