Remove unused NonIterableBitMask::HighestBitSet function.

PiperOrigin-RevId: 781886211
Change-Id: Ia2bba19bfe8975c7a22148e043310df726465a5c

Author: ezbr

absl/container/internal/hashtable_control_bytes.h

@@ -91,11 +91,6 @@ class NonIterableBitMask {
     return container_internal::TrailingZeros(mask_) >> Shift;
   }
 
-  // Returns the index of the highest *abstract* bit set in `self`.
-  uint32_t HighestBitSet() const {
-    return static_cast<uint32_t>((bit_width(mask_) - 1) >> Shift);
-  }
-
   // Returns the number of trailing zero *abstract* bits.
   uint32_t TrailingZeros() const {
     return container_internal::TrailingZeros(mask_) >> Shift;

absl/container/internal/hashtable_control_bytes_test.cc

@@ -165,13 +165,11 @@ TYPED_TEST(GroupTest, MaskEmpty) {
                       CtrlT(7),       CtrlT(5), CtrlT(3),          CtrlT(1),
                       CtrlT(1),       CtrlT(1), CtrlT(1),          CtrlT(1)};
     EXPECT_THAT(GroupType{group}.MaskEmpty().LowestBitSet(), 0);
-    EXPECT_THAT(GroupType{group}.MaskEmpty().HighestBitSet(), 4);
   } else if (GroupType::kWidth == 8) {
     ctrl_t group[] = {ctrl_t::kEmpty,    CtrlT(1), CtrlT(2),
                       ctrl_t::kDeleted,  CtrlT(2), CtrlT(1),
                       ctrl_t::kSentinel, CtrlT(1)};
     EXPECT_THAT(GroupType{group}.MaskEmpty().LowestBitSet(), 0);
-    EXPECT_THAT(GroupType{group}.MaskEmpty().HighestBitSet(), 0);
   } else {
     FAIL() << "No test coverage for Group::kWidth==" << GroupType::kWidth;
   }
@@ -225,13 +223,11 @@ TYPED_TEST(GroupTest, MaskEmptyOrDeleted) {
                       CtrlT(7),         CtrlT(5), CtrlT(3),          CtrlT(1),
                       CtrlT(1),         CtrlT(1), CtrlT(1),          CtrlT(1)};
     EXPECT_THAT(GroupType{group}.MaskEmptyOrDeleted().LowestBitSet(), 0);
-    EXPECT_THAT(GroupType{group}.MaskEmptyOrDeleted().HighestBitSet(), 4);
   } else if (GroupType::kWidth == 8) {
     ctrl_t group[] = {ctrl_t::kEmpty,    CtrlT(1), CtrlT(2),
                       ctrl_t::kDeleted,  CtrlT(2), CtrlT(1),
                       ctrl_t::kSentinel, CtrlT(1)};
     EXPECT_THAT(GroupType{group}.MaskEmptyOrDeleted().LowestBitSet(), 0);
-    EXPECT_THAT(GroupType{group}.MaskEmptyOrDeleted().HighestBitSet(), 3);
   } else {
     FAIL() << "No test coverage for Group::kWidth==" << GroupType::kWidth;
   }
@@ -247,13 +243,11 @@ TYPED_TEST(GroupTest, MaskFullOrSentinel) {
         ctrl_t::kEmpty,   ctrl_t::kDeleted, ctrl_t::kDeleted,  ctrl_t::kDeleted,
     };
     EXPECT_THAT(GroupType{group}.MaskFullOrSentinel().LowestBitSet(), 3);
-    EXPECT_THAT(GroupType{group}.MaskFullOrSentinel().HighestBitSet(), 6);
   } else if (GroupType::kWidth == 8) {
     ctrl_t group[] = {ctrl_t::kEmpty,   ctrl_t::kDeleted, CtrlT(2),
                       ctrl_t::kDeleted, CtrlT(2),         ctrl_t::kSentinel,
                       ctrl_t::kDeleted, ctrl_t::kEmpty};
     EXPECT_THAT(GroupType{group}.MaskFullOrSentinel().LowestBitSet(), 2);
-    EXPECT_THAT(GroupType{group}.MaskFullOrSentinel().HighestBitSet(), 5);
   } else {
     FAIL() << "No test coverage for Group::kWidth==" << GroupType::kWidth;
   }