Adjust grammar.

Author: ekpyron

docs/grammar/SolidityLexer.g4

@@ -251,6 +251,12 @@ mode AssemblyBlockMode;
 AssemblyDialect: '"evmasm"';
 AssemblyLBrace: '{' -> popMode, pushMode(YulMode);
 
+AssemblyFlagString: '"' DoubleQuotedStringCharacter+ '"';
+
+AssemblyBlockLParen: '(';
+AssemblyBlockRParen: ')';
+AssemblyBlockComma: ',';
+
 AssemblyBlockWS: [ \t\r\n\u000C]+ -> skip ;
 AssemblyBlockCOMMENT: '/*' .*? '*/' -> channel(HIDDEN) ;
 AssemblyBlockLINE_COMMENT: '//' ~[\r\n]* -> channel(HIDDEN) ;

docs/grammar/SolidityParser.g4

@@ -476,7 +476,13 @@ revertStatement: Revert expression callArgumentList Semicolon;
  * The contents of an inline assembly block use a separate scanner/lexer, i.e. the set of keywords and
  * allowed identifiers is different inside an inline assembly block.
  */
-assemblyStatement: Assembly AssemblyDialect? AssemblyLBrace yulStatement* YulRBrace;
+assemblyStatement: Assembly AssemblyDialect? assemblyFlags? AssemblyLBrace yulStatement* YulRBrace;
+
+/**
+ * Assembly flags.
+ * Comma-separated list of double-quoted strings as flags.
+ */
+assemblyFlags: AssemblyBlockLParen AssemblyFlagString (AssemblyBlockComma AssemblyFlagString)* AssemblyBlockRParen;
 
 //@doc:inline
 variableDeclarationList: variableDeclarations+=variableDeclaration (Comma variableDeclarations+=variableDeclaration)*;