1ce1732f82
When IRBuilder is given an insertion position and there is debug-info, it sets the DebugLoc of newly inserted instructions to the DebugLoc of the insertion position. Unfortunately, that means if you insert in front of a debug intrinsics, your "real" instructions get potentially-misleading source locations from the debug intrinsics. Worse, if you compile -gmlt to get source locations but no variable locations, you'll get different source locations to a normal -g build, which is silly. Rectify this with the getStableDebugLoc method, which skips over any debug intrinsics to find the next "real" instruction. This is the source location that you would get if you compile with -gmlt, and it remains stable in the presence of debug intrinsics. The changed tests show a few locations where this has been happening, for example selecting line-zero locations for instrumentation on a perfectly valid call site. Differential Revision: https://reviews.llvm.org/D159485
The LLVM Compiler Infrastructure
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