Place temporary LTO files into their own subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165600 91177308-0d34-0410-b5e6-96231b3b80d8

tools/libclang/Makefile

@@ -55,7 +55,7 @@ ifeq ($(HOST_OS),Darwin)
 
     # If we're doing an Apple-style build, add the LTO object path.
     ifeq ($(RC_BUILDIT),YES)
-       TempFile         = $(shell mktemp ${OBJROOT}/clang-lto.XXXXXX)
+       TempFile        := $(shell mkdir -p ${OBJROOT}/dSYMs ; mktemp ${OBJROOT}/dSYMs/clang-lto.XXXXXX)
        LLVMLibsOptions += -Wl,-object_path_lto -Wl,$(TempFile)
     endif
 endif