Revert "[AsmParser][SystemZ][z/OS] Introducing HLASM Comment Syntax"

This reverts commit bcdd40f.
See https://reviews.llvm.org/D98543.

Author: hubert-reinterpretcast

llvm/include/llvm/MC/MCAsmInfo.h

@@ -122,14 +122,10 @@ class MCAsmInfo {
   /// other when on the same line.  Defaults to ';'
   const char *SeparatorString;
 
-  /// This indicates the comment string used by the assembler.  Defaults to
+  /// This indicates the comment character used by the assembler.  Defaults to
   /// "#"
   StringRef CommentString;
 
-  /// This indicates whether the comment string is only accepted as a comment
-  /// at the beginning of statements. Defaults to false.
-  bool RestrictCommentStringToStartOfStatement = false;
-
   /// This is appended to emitted labels.  Defaults to ":"
   const char *LabelSuffix;
 
@@ -561,9 +557,6 @@ class MCAsmInfo {
   unsigned getCommentColumn() const { return 40; }
 
   StringRef getCommentString() const { return CommentString; }
-  bool getRestrictCommentStringToStartOfStatement() const {
-    return RestrictCommentStringToStartOfStatement;
-  }
   const char *getLabelSuffix() const { return LabelSuffix; }
 
   bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }

llvm/lib/MC/MCParser/AsmLexer.cpp

@@ -659,9 +659,6 @@ size_t AsmLexer::peekTokens(MutableArrayRef<AsmToken> Buf,
 }
 
 bool AsmLexer::isAtStartOfComment(const char *Ptr) {
-  if (MAI.getRestrictCommentStringToStartOfStatement() && !IsAtStartOfStatement)
-    return false;
-
   StringRef CommentString = MAI.getCommentString();
 
   if (CommentString.size() == 1)

llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmInfo.cpp

@@ -21,8 +21,7 @@ SystemZMCAsmInfo::SystemZMCAsmInfo(const Triple &TT) {
 
   MaxInstLength = 6;
 
-  CommentString = AssemblerDialect == AD_HLASM ? "*" : "#";
-  RestrictCommentStringToStartOfStatement = (AssemblerDialect == AD_HLASM);
+  CommentString = "#";
   ZeroDirective = "\t.space\t";
   Data64bitsDirective = "\t.quad\t";
   UsesELFSectionDirectiveForBSS = true;