[WGSL] Check for recursion depth in lhs expression

https://bugs.webkit.org/show_bug.cgi?id=268459
rdar://121520440

Reviewed by Mike Wyrzykowski.

We have recursion depth checks in expressions and statements, but lhs expressions
(e.g. *****x = ...) can recurse without going through either of those.

* Source/WebGPU/WGSL/Parser.cpp:
(WGSL::Parser<Lexer>::parseLHSExpression):

Canonical link: https://commits.webkit.org/273914@main

Source/WebGPU/WGSL/Parser.cpp

@@ -1763,6 +1763,8 @@ Result<AST::Expression::Ref> Parser<Lexer>::parseLHSExpression()
     START_PARSE();
 
     if (current().type == TokenType::And || current().type == TokenType::Star) {
+        CHECK_RECURSION();
+
         auto op = toUnaryOperation(current());
         consume();
         PARSE(expression, LHSExpression);