When a compound requirement is too long to fit onto a single line, the
braces are split apart onto separate lines, and the contained expression
is indented. However, this indentation would also apply to the closing
brace and the trailing return type requirement thereof.
This was because the indentation level was being restored after all
trailing things were already read
With this change, the initial level of the opening brace is set before
attempting to read any trailing return type requirements
Fixes https://github.com/llvm/llvm-project/issues/57108
Reviewed By: HazardyKnusperkeks, owenpan, MyDeveloperDay
Differential Revision: https://reviews.llvm.org/D134626
1fa115b569