[ms] [llvm-ml] Remove space-separated argument support (llvm#132750)

This leads to errors when parsing MASM macro calls, and was retained
from AsmParser by mistake.

Fixes llvm#132074

Author: ericastor

llvm/lib/MC/MCParser/MasmParser.cpp

@@ -450,9 +450,6 @@ class MasmParser : public MCAsmParser {
   /// Defaults to 1U, meaning Intel.
   unsigned AssemblerDialect = 1U;
 
-  /// is Darwin compatibility enabled?
-  bool IsDarwin = false;
-
   /// Are we parsing ms-style inline assembly?
   bool ParsingMSInlineAsm = false;
 
@@ -2589,24 +2586,6 @@ static bool isOperator(AsmToken::TokenKind kind) {
   }
 }
 
-namespace {
-
-class AsmLexerSkipSpaceRAII {
-public:
-  AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
-    Lexer.setSkipSpace(SkipSpace);
-  }
-
-  ~AsmLexerSkipSpaceRAII() {
-    Lexer.setSkipSpace(true);
-  }
-
-private:
-  AsmLexer &Lexer;
-};
-
-} // end anonymous namespace
-
 bool MasmParser::parseMacroArgument(const MCAsmMacroParameter *MP,
                                     MCAsmMacroArgument &MA,
                                     AsmToken::TokenKind EndTok) {
@@ -2633,43 +2612,12 @@ bool MasmParser::parseMacroArgument(const MCAsmMacroParameter *MP,
 
   unsigned ParenLevel = 0;
 
-  // Darwin doesn't use spaces to delmit arguments.
-  AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
-
-  bool SpaceEaten;
-
   while (true) {
-    SpaceEaten = false;
     if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
       return TokError("unexpected token");
 
-    if (ParenLevel == 0) {
-      if (Lexer.is(AsmToken::Comma))
-        break;
-
-      if (Lexer.is(AsmToken::Space)) {
-        SpaceEaten = true;
-        Lex(); // Eat spaces.
-      }
-
-      // Spaces can delimit parameters, but could also be part an expression.
-      // If the token after a space is an operator, add the token and the next
-      // one into this argument
-      if (!IsDarwin) {
-        if (isOperator(Lexer.getKind()) && Lexer.isNot(EndTok)) {
-          MA.push_back(getTok());
-          Lex();
-
-          // Whitespace after an operator can be ignored.
-          if (Lexer.is(AsmToken::Space))
-            Lex();
-
-          continue;
-        }
-      }
-      if (SpaceEaten)
-        break;
-    }
+    if (ParenLevel == 0 && Lexer.is(AsmToken::Comma))
+      break;
 
     // handleMacroEntry relies on not advancing the lexer here
     // to be able to fill in the remaining default parameter values