Fix builds with llvm/runtimes/compiler-rt after r354365
Compiler-rt doesn't include config-ix which was providing CheckSymbolExists to
the LLVM build. Add it to HandleLLVMOptions to fix this
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354389 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index 694fe94..ee9429e 100644
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -10,6 +10,7 @@
include(HandleLLVMStdlib)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
+include(CheckSymbolExists)
if(CMAKE_LINKER MATCHES "lld-link\.exe" OR (WIN32 AND LLVM_USE_LINKER STREQUAL "lld") OR LLVM_ENABLE_LLD)
set(LINKER_IS_LLD_LINK TRUE)
