Fix debug info in LICM

Use RegularLocation::getAutoGeneratedLocation() while hoisting a load.
Previously the source location of the preheader's terminator was used,
this need not be a RegularLocationKind triggering verification errors.

Author: meg-gupta

lib/SILOptimizer/LoopTransforms/LICM.cpp

@@ -1432,7 +1432,7 @@ hoistLoadsAndStores(AccessPath accessPath, SILLoop *loop) {
     return;
 
   LoadInst *initialLoad =
-      B.createLoad(preheader->getTerminator()->getLoc(), initialAddr,
+      B.createLoad(RegularLocation::getAutoGeneratedLocation(), initialAddr,
                    LoadOwnershipQualifier::Unqualified);
   LLVM_DEBUG(llvm::dbgs() << "Creating preload " << *initialLoad);
   ssaUpdater.addAvailableValue(preheader, initialLoad);