[ADT] Move drop_begin from iterator_range.h into STLExtras.

Summary:
drop_begin depends on adl_begin/adl_end, which are defined in STLExtras.h,
but we can't just #include STLExtras.h in iterator_range.h as that would
introduce a circular reference (STLExtras.h already depends on
iterator_range.h). The simplest solution is to move drop_begin into
STLExtras.h, which is a reasonable home for it anyway.

Reviewers: dblaikie

Subscribers: dexonsmith, ributzka, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70189

1 files changed, 0 insertions, 13 deletions

diff --git a/llvm/unittests/ADT/IteratorTest.cpp b/llvm/unittests/ADT/IteratorTest.cpp
index 73fd15e90e9..de74811321a 100644
--- a/llvm/unittests/ADT/IteratorTest.cpp
+++ b/llvm/unittests/ADT/IteratorTest.cpp
@@ -449,17 +449,4 @@ TEST(RangeTest, Distance) {
   EXPECT_EQ(std::distance(v2.begin(), v2.end()), size(v2));
 }
 
-TEST(IteratorRangeTest, DropBegin) {
-  SmallVector<int, 5> vec{0, 1, 2, 3, 4};
-
-  for (int n = 0; n < 5; ++n) {
-    int i = n;
-    for (auto &v : drop_begin(vec, n)) {
-      EXPECT_EQ(v, i);
-      i += 1;
-    }
-    EXPECT_EQ(i, 5);
-  }
-}
-
 } // anonymous namespace