[SILBuilder] Remove stray comma when NDEBUG

Author: DougGregor

include/swift/SIL/SILBuilder.h

@@ -480,9 +480,8 @@ class SILBuilder {
                                Optional<SILDebugVariable> Var = None,
                                bool hasDynamicLifetime = false,
                                bool reflection = false,
-                               bool usesMoveableValueDebugInfo = false
+                               bool usesMoveableValueDebugInfo = false,
 #ifndef NDEBUG
-                               ,
                                bool skipVarDeclAssert = false,
 #endif
                                bool hasPointerEscape = false) {