[clang-format] Remove double trim

[MyDeveloperDay]

Can you please clang format, but apart from that this looks fine

[klimek]

Isn't the comment incorrect after this patch?

[HazardyKnusperkeks]

In D91996#2417892, @klimek wrote:

Isn't the comment incorrect after this patch?

I actually thought the same after I saw the diff here, but had no time yet to modify it. I will now also remove the comment.

[HazardyKnusperkeks]

Formatted and now superfluous comment removed.

[MyDeveloperDay]

In D91996#2417892, @klimek wrote:

Isn't the comment incorrect after this patch?

clang/lib/Format/BreakableToken.cpp

for (const FormatToken *CurrentTok = &Tok;
     Content.resize(Lines.size());
     ContentColumn.resize(Lines.size());
     OriginalContentColumn.resize(Lines.size());
     Tokens.resize(Lines.size());
     Prefix.resize(Lines.size());
     OriginalPrefix.resize(Lines.size());
     for (size_t i = FirstLineIndex, e = Lines.size(); i < e; ++i) {
       Lines[i] = Lines[i].ltrim(Blanks);
-      // We need to trim the blanks in case this is not the first line in a
-      // multiline comment. Then the indent is included in Lines[i].
-      StringRef IndentPrefix =
-          getLineCommentIndentPrefix(Lines[i].ltrim(Blanks), Style);
+      StringRef IndentPrefix = getLineCommentIndentPrefix(Lines[i], Style);
       assert((TokenText.startswith("//") || TokenText.startswith("#")) &&
              "unsupported line comment prefix, '//' and '#' are supported");
       OriginalPrefix[i] = Prefix[i] = IndentPrefix;
       if (Lines[i].size() > Prefix[i].size() &&
           isAlphanumeric(Lines[i][Prefix[i].size()])) {
         if (Prefix[i] == "//")
           Prefix[i] = "// ";
         else if (Prefix[i] == "///")