Auto merge of #37083 - nnethercote:uleb128, r=eddyb

Inline read_{un,}signed_leb128 and opaque::Decoder functions.

`read_unsigned_leb128` is hot within rustc because it's heavily used
during the reading of crate metadata. This commit tweaks its signature
(and that of `read_signed_leb128`, for consistency) so it can increment
the buffer index directly instead of maintaining its own copy, the
change in which is then used by the caller to advance the index.

This reduces the instruction count (as measured by Cachegrind) for some
benchmarks a bit, e.g. hyper-0.5.0 by 0.7%.

0 files changed, 0 insertions, 0 deletions