Transforms: Use the new DebugLoc API, NFC

Update lib/Analysis and lib/Transforms to use the new `DebugLoc` API.

llvm-svn: 233587
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 02b9170..e0dfb67 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -2723,7 +2723,7 @@
         DEBUG(dbgs() << "IC: Old = " << *I << '\n'
                      << "    New = " << *Result << '\n');
 
-        if (!I->getDebugLoc().isUnknown())
+        if (I->getDebugLoc())
           Result->setDebugLoc(I->getDebugLoc());
         // Everything uses the new instruction now.
         I->replaceAllUsesWith(Result);