[clang][PGO] Apply artificial DebugLoc to llvm.instrprof.increment instructions #8685
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Prior to this change the debug-location for the
llvm.instrprof.increment
intrinsic was set to whatever the current DIBuilder's current debug location was set to. This meant that for switch-statements, a counter's location was set to the previous case's debug-location, causing confusing stepping behaviour in debuggers. This patch makes sure we attach a dummy debug-location for the increment instructions.rdar://123050737
(cherry picked from commit 4113e15)