[lld][MachO] Read cstring order for non deduped sections (#161879)

https://github.com/llvm/llvm-project/pull/140307 added support for
cstring hashes in the orderfile to layout cstrings in a specific order,
but only when `--deduplicate-strings` is used. This PR supports cstring
ordering when `--no-deduplicate-strings` is used.

1. Create `cStringPriorities`, separate from `priorities`, to hold only
priorities for cstring pieces. This allows us to lookup by hash
directly, instead of first converting to a string. It also fixes a
contrived bug where we want to order a symbol named `CSTR;12345` rather
than a cstring.

2. Rather than calling `buildCStringPriorities()` which always
constructs and returns a vector, we use `forEachStringPiece()` to
efficiently iterate over cstring pieces without creating a new vector if
no cstring is ordered.

3. Create `SymbolPriorityEntry::{get,set}Priority()` helper functions to
simplify code.

0 files changed, 0 insertions, 0 deletions