Export TARGET_TRIPLE on LLVM.cmake. It is necessary for running tests
on Clang when it builds using LLVM as an external library.

Fixes PR9293.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126309 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/LLVM.cmake b/cmake/modules/LLVM.cmake
index 0dc5058..9182afd 100644
--- a/cmake/modules/LLVM.cmake
+++ b/cmake/modules/LLVM.cmake
@@ -10,6 +10,8 @@
 
 set(LLVM_TARGETS_TO_BUILD @LLVM_TARGETS_TO_BUILD@)
 
+set(TARGET_TRIPLE "@TARGET_TRIPLE@")
+
 set(LLVM_TOOLS_BINARY_DIR @LLVM_TOOLS_BINARY_DIR@)
 
 set(LLVM_ENABLE_THREADS @LLVM_ENABLE_THREADS@)