[lld/mac] Tweak a few comments

[thakis]

Summary

Addresses review feedback I had missed on https://reviews.llvm.org/D122624

No behavior change.

[oontvoo]

lld/test/MachO/arm64-thunk-visibility.s

4

nit: remove one extra white space

[int3]

Thanks!

[thakis]

thanks!

lld/test/MachO/arm64-thunk-visibility.s

4

joinspaces defaults to 2 in vim, and I don't mind that enough to turn it off. Either way's fine imho.

lld/MachO/ConcatOutputSection.cpp

 //
 // * DenseMap<Symbol *, ThunkInfo> thunkMap: Maps the function symbol
 //   to its thunk bookkeeper.
 //
 // * struct ThunkInfo (bookkeeper): Call instructions have limited range, and
 //   distant call sites might be unable to reach the same thunk, so multiple
 //   thunks are necessary to serve all call sites in a very large program. A
 //   thunkInfo stores state for all thunks associated with a particular
-//   function: (a) thunk symbol, (b) input section containing stub code, and
-//   (c) sequence number for the active thunk incarnation. When an old thunk
-//   goes out of range, we increment the sequence number and create a new
-//   thunk named <FUNCTION>.thunk.<SEQUENCE>.
-//
-// * A thunk consists of (a) a Defined symbol pointing to
-//   (b) an InputSection holding machine instructions (similar to a MachO
-//   stub), and (c) Reloc(s) that reference the real function for fixing-up
-//   the stub code.
+//   function:
+//     (a) thunk symbol
+//     (b) input section containing stub code, and
+//     (c) sequence number for the active thunk incarnation.
+//   When an old thunk goes out of range, we increment the sequence number and
+//   create a new thunk named <FUNCTION>.thunk.<SEQUENCE>.
+//
+// * A thunk consists of
+//     (a) a Defined symbol pointing to
+//     (b) an InputSection holding machine code (similar to a MachO stub), and
+//     (c) relocs referencing the real function for fixing up the stub code.
 //
 // * std::vector<InputSection *> MergedInputSection::thunks: A vector parallel
 //   to the inputs vector. We store new thunks via cheap vector append, rather
 //   than costly insertion into the inputs vector.
 //
 // Control Flow:
 //
 // * During address assignment, MergedInputSection::finalize() examines call

lld/test/MachO/arm64-thunk-visibility.s

 # REQUIRES: aarch64
 
 # foo.s and bar.s both contain TU-local symbols (think static function)
-# with the same name, and both need a thunk..  This tests that ld64.lld doesn't
+# with the same name, and both need a thunk.  This tests that ld64.lld doesn't
 # create a duplicate symbol for the two functions.
 
 # Test this both when the TU-local symbol is the branch source or target,
 # and for both forward and backwards jumps.
 
 # RUN: rm -rf %t; split-file %s %t
 # RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %t/foo.s -o %t/foo.o
 # RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %t/bar.s -o %t/bar.o