[rustc_builtin_macros] add indices to format_foreign::printf::Substitution::Escape #92460
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Fixes #92267.
The problem was that the escape string "%%" does not need to appear at the very beginning of the format string, but
the iterator implementation assumed that it did.
The solution follows the pattern used by
format_foregin::shell::Subtitution::Escape
:rust/compiler/rustc_builtin_macros/src/format_foreign.rs
Line 629 in 8ed935e