This change makes sure that MemOpt pass calculate identical distance

value for instructions in debug and nondebug optimization. This was
required because in some cases MemOpt passes was creating different code
for identical code in debug and non debug version.

Author: Kotynia, Piotr

IGC/Compiler/CISACodeGen/MemOpt.cpp

@@ -482,6 +482,14 @@ bool MemOpt::runOnFunction(Function& F) {
         unsigned Distance = 0;
         for (auto BI = BB->begin(), BE = BB->end(); BI != BE; ++BI, ++Distance) {
             Instruction* I = &(*BI);
+
+            // Make sure we don't count debug info intrinsincs
+            // This is required to keep debug and non-debug optimizations identical
+            if (isDbgIntrinsic(I)) {
+                Distance--;
+                continue;
+            }
+
             // Skip irrelevant instructions.
             if (shouldSkip(I))
                 continue;