[llvm] [llvm][mustache] Align standalone partial indentation with spec (PR #159185)

[Erick Velez via llvm-commits]

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@@ -292,8 +292,7 @@ void stripTokenBefore(SmallVectorImpl<Token> &Tokens, size_t Idx,
   StringRef PrevTokenBody = PrevToken.TokenBody;
   StringRef Unindented = PrevTokenBody.rtrim(" \r\t\v");
   size_t Indentation = PrevTokenBody.size() - Unindented.size();
-  if (CurrentType != Token::Type::Partial)
-    PrevToken.TokenBody = Unindented.str();
+  PrevToken.TokenBody = Unindented.str();
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evelez7 wrote:

Is the function comment possibly stale now, since the distinction for partials is no longer made?

```
// The exception for this is partial tag which requires us to
// keep track of the indentation once it's rendered.
```

https://github.com/llvm/llvm-project/pull/159185