build/Make: Switch over to using llvm-config-2 for dependencies one more (hopefully last) time, now that it also builds as a build tool.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144535 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index e5719b3..3816bbb 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -527,7 +527,11 @@
     LLVM_TBLGEN   := $(LLVMToolDir)/llvm-tblgen$(EXEEXT)
   endif
 endif
-LLVM_CONFIG := $(LLVMToolDir)/llvm-config
+ifeq ($(LLVM_CROSS_COMPILING),1)
+  LLVM_CONFIG := $(BuildLLVMToolDir)/llvm-config-2$(BUILD_EXEEXT)
+else
+  LLVM_CONFIG := $(LLVMToolDir)/llvm-config-2$(EXEEXT)
+endif
 ifndef LLVMLD
 LLVMLD    := $(LLVMToolDir)/llvm-ld$(EXEEXT)
 endif