Move all file specific globals to anonymous namespace

libsolidity/ast/Types.cpp

@@ -304,6 +304,9 @@ MemberList::MemberMap Type::boundFunctions(Type const& _type, ContractDefinition
 	return members;
 }
 
+namespace
+{
+
 bool isValidShiftAndAmountType(Token::Value _operator, Type const& _shiftAmountType)
 {
 	// Disable >>> here.
@@ -317,6 +320,8 @@ bool isValidShiftAndAmountType(Token::Value _operator, Type const& _shiftAmountT
 		return false;
 }
 
+}
+
 IntegerType::IntegerType(int _bits, IntegerType::Modifier _modifier):
 	m_bits(_bits), m_modifier(_modifier)
 {