gn build: Fix Windows builds after r357797

llvm-svn: 358004
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
index d648567..3a293c0 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
@@ -853,7 +853,7 @@
                       MCDisassembler *Disassembler,
                       MCInstPrinter *InstPrinter,
                       raw_ostream &ErrStream)
-    : Impl(llvm::make_unique<RuntimeDyldCheckerImpl>(
+    : Impl(::llvm::make_unique<RuntimeDyldCheckerImpl>(
                                             std::move(IsSymbolValid),
                                             std::move(GetSymbolAddress),
                                             std::move(GetSymbolContent),