[SmallVector] Add an explicit SmallVector(size_t Size) constructor.

Previously we used the SmallVector(size_t Size, const T& Value) constructor
with a default constructed Value. That will copy construct every element
in the vector, but not all types can be copy constructed.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D147426

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/unittests/ADT/SmallVectorTest.cpp b/llvm/unittests/ADT/SmallVectorTest.cpp
index fd3780a..8465257 100644
--- a/llvm/unittests/ADT/SmallVectorTest.cpp
+++ b/llvm/unittests/ADT/SmallVectorTest.cpp
@@ -171,6 +171,11 @@ LLVM_ATTRIBUTE_USED void CompileTest() {
   V.resize(42);
 }
 
+TEST(SmallVectorTest, ConstructNonCopyableTest) {
+  SmallVector<NonCopyable, 0> V(42);
+  EXPECT_EQ(V.size(), 42);
+}
+
 // Assert that v contains the specified values, in order.
 template <typename VectorT>
 void assertValuesInOrder(VectorT &v, size_t size, ...) {