[ELF] Allow ? without adjacent space

GNU ld allows 1 ? 2?3:4 : 5?6 :7

Author: MaskRay

lld/ELF/ScriptLexer.cpp

@@ -192,7 +192,7 @@ bool ScriptLexer::atEOF() { return errorCount() || tokens.size() == pos; }
 // Split a given string as an expression.
 // This function returns "3", "*" and "5" for "3*5" for example.
 static std::vector<StringRef> tokenizeExpr(StringRef s) {
-  StringRef ops = "+-*/:!~=<>"; // List of operators
+  StringRef ops = "!~*/+-<>?:="; // List of operators
 
   // Quoted strings are literal strings, so we don't want to split it.
   if (s.startswith("\""))

lld/test/ELF/linkerscript/operators.test

@@ -25,7 +25,7 @@ SECTIONS {
   logicalor = (0 || 0) + (0||1)*2 + (1|| 0)*4 + (1 ||1) *8;
   logicalor2 = 0 && 0 || 1 && 1;
   ternary1 = 0 ? 1 : 2 & 6;
-  ternary2 = 1 ? 2 ? 3 : 4 : 5 ? 6 : 7;
+  ternary2 = 1 ? 2?3:4 : 5?6 :7;
 
   plusassign =1;
   plusassign += 2;