Record in parse table which actions can hide splits

Suppose a parse state S has multiple actions for a terminal lookahead symbol A.
Then during incremental parsing, while in state S, the parser should not
reuse a non-terminal lookahead B where FIRST(B) contains A, because reusing B
might prematurely discard one of the possible actions that a batch parser
would have attempted in state S, upon seeing A as a lookahead.

src/compiler/syntax_grammar.cc

@@ -21,9 +21,7 @@ SyntaxVariable::SyntaxVariable(const string &name, VariableType type,
 
 ProductionStep::ProductionStep(const rules::Symbol &symbol, int precedence,
                                rules::Associativity associativity)
-    : symbol(symbol),
-      precedence(precedence),
-      associativity(associativity) {}
+    : symbol(symbol), precedence(precedence), associativity(associativity) {}
 
 bool ProductionStep::operator==(const ProductionStep &other) const {
   return symbol == other.symbol && precedence == other.precedence &&