[libc] fix readability-identifier-naming in memory_utils/utils.h (#83919

)

Fixes:

    libc/src/string/memory_utils/utils.h:345:13: warning: invalid case style
    for member 'offset_' [readability-identifier-naming]

Having a trailing underscore for members is a google3 style, not LLVM style.
Removing the underscore is insufficient, as we would then have 2 members with
the same identifier which is not allowed (it is a compile time error). Remove
the getter, and just access the renamed member that's now made public.

libc/src/string/memory_utils/op_generic.h

@@ -453,7 +453,7 @@ template <typename T> struct Memcmp {
     if (LIBC_UNLIKELY(count >= threshold) && helper.not_aligned()) {
       if (auto value = block(p1, p2))
         return value;
-      adjust(helper.offset(), p1, p2, count);
+      adjust(helper.offset, p1, p2, count);
     }
     return loop_and_tail(p1, p2, count);
   }
@@ -533,7 +533,7 @@ template <typename T> struct Bcmp {
     if (LIBC_UNLIKELY(count >= threshold) && helper.not_aligned()) {
       if (auto value = block(p1, p2))
         return value;
-      adjust(helper.offset(), p1, p2, count);
+      adjust(helper.offset, p1, p2, count);
     }
     return loop_and_tail(p1, p2, count);
   }

libc/src/string/memory_utils/utils.h

@@ -336,13 +336,10 @@ LIBC_INLINE void align_to_next_boundary(T1 *__restrict &p1, T2 *__restrict &p2,
 
 template <size_t SIZE> struct AlignHelper {
   LIBC_INLINE AlignHelper(CPtr ptr)
-      : offset_(distance_to_next_aligned<SIZE>(ptr)) {}
+      : offset(distance_to_next_aligned<SIZE>(ptr)) {}
 
-  LIBC_INLINE bool not_aligned() const { return offset_ != SIZE; }
-  LIBC_INLINE uintptr_t offset() const { return offset_; }
-
-private:
-  uintptr_t offset_;
+  LIBC_INLINE bool not_aligned() const { return offset != SIZE; }
+  uintptr_t offset;
 };
 
 LIBC_INLINE void prefetch_for_write(CPtr dst) {