[llvm-bugs] [Bug 41827] New: [DebugInfo at O2] Add stricter assertions and checks for debug intrinsic linenos

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41827

            Bug ID: 41827
           Summary: [DebugInfo at O2] Add stricter assertions and checks for
                    debug intrinsic linenos
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: wrong-debug
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: jeremy.morse.llvm at gmail.com
                CC: llvm-bugs at lists.llvm.org

As brought up in this review [0], with debugging intrinsics being given zero
linenos (as damage limitation in case they leak), we should enforce this in
more locations. Bjorn suggests:

 * Also fix calls to DIBuilder::insertDbgValueIntrinsic in LoopUtils, Debugify
   and LLVMDIBuilder* the same way.
 * Assert that line/col is zero in DIBuilder::insertDbgValueIntrinsic.
 * Add checks in Verifier and MachineVerifier that line/col is zero for 
   dbg.value/DBG_VALUE.

This should also expose any circumstances where debug intrinsics have their
DebugLocs replaced with "real" locations (potentially changing their scope),
which is the complementary error case to what [0] fixes.

[0] https://reviews.llvm.org/D59272?id=198638

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