[OPENMP] Require valid SourceLocation in function call, NFC.

Removed default empty SourceLocation argument from `emitCall` function
and require valid location.

llvm-svn: 325812
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.h b/clang/lib/CodeGen/CGOpenMPRuntime.h
index e1ba833..046228e 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.h
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.h
@@ -251,9 +251,8 @@
   virtual StringRef getOutlinedHelperName() const { return ".omp_outlined."; }
 
   /// Emits \p Callee function call with arguments \p Args with location \p Loc.
-  void emitCall(CodeGenFunction &CGF, llvm::Value *Callee,
-                ArrayRef<llvm::Value *> Args = llvm::None,
-                SourceLocation Loc = SourceLocation()) const;
+  void emitCall(CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *Callee,
+                ArrayRef<llvm::Value *> Args = llvm::None) const;
 
 private:
   /// \brief Default const ident_t object used for initialization of all other