[MC] Drop whitespace padding in AMDGPU combined asm/disasm tests. (#104433)

A follow-up from

<#92895 (comment)>.

Author: kosarev

llvm/include/llvm/MC/MCAsmInfo.h

@@ -493,6 +493,9 @@ class MCAsmInfo {
   /// Preserve Comments in assembly
   bool PreserveAsmComments;
 
+  /// The column (zero-based) at which asm comments should be printed.
+  unsigned CommentColumn = 40;
+
   /// True if the integrated assembler should interpret 'a >> b' constant
   /// expressions as logical rather than arithmetic.
   bool UseLogicalShr = true;
@@ -606,9 +609,8 @@ class MCAsmInfo {
   bool getStarIsPC() const { return StarIsPC; }
   const char *getSeparatorString() const { return SeparatorString; }
 
-  /// This indicates the column (zero-based) at which asm comments should be
-  /// printed.
-  unsigned getCommentColumn() const { return 40; }
+  unsigned getCommentColumn() const { return CommentColumn; }
+  void setCommentColumn(unsigned Col) { CommentColumn = Col; }
 
   StringRef getCommentString() const { return CommentString; }
   bool getRestrictCommentStringToStartOfStatement() const {