[DebugInfo] Remove a default location argument from setCurrentLoc

Having a default location of None doesn't seem to enhance readability.

Author: vedantk

lib/IRGen/IRGenDebugInfo.cpp

@@ -125,7 +125,7 @@ class IRGenDebugInfoImpl : public IRGenDebugInfo {
   void finalize();
 
   void setCurrentLoc(IRBuilder &Builder, const SILDebugScope *DS,
-                     Optional<SILLocation> Loc = None);
+                     Optional<SILLocation> Loc);
   void clearLoc(IRBuilder &Builder);
   void pushLoc();
   void popLoc();

lib/IRGen/IRGenDebugInfo.h

@@ -57,7 +57,7 @@ class IRGenDebugInfo {
   /// Update the IRBuilder's current debug location to the location
   /// Loc and the lexical scope DS.
   void setCurrentLoc(IRBuilder &Builder, const SILDebugScope *DS,
-                     Optional<SILLocation> Loc = None);
+                     Optional<SILLocation> Loc);
 
   void clearLoc(IRBuilder &Builder);
 

lib/IRGen/IRGenSIL.cpp

@@ -1790,7 +1790,7 @@ void IRGenSILFunction::visitSILBasicBlock(SILBasicBlock *BB) {
         if (Prev != BB->end())
           DS = Prev->getDebugScope();
         // Use an artificial (line 0) location.
-        IGM.DebugInfo->setCurrentLoc(Builder, DS);
+        IGM.DebugInfo->setCurrentLoc(Builder, DS, None);
       }
 
       if (isa<TermInst>(&I))