disable exports from a bunch more tools, those without plugins.

llvm-svn: 65558
diff --git a/llvm/tools/llvm-link/Makefile b/llvm/tools/llvm-link/Makefile
index fdb1c19..ddc7a59 100644
--- a/llvm/tools/llvm-link/Makefile
+++ b/llvm/tools/llvm-link/Makefile
@@ -11,4 +11,7 @@
 TOOLNAME = llvm-link
 LINK_COMPONENTS = linker bitreader bitwriter
 
+# This tool has no plugins, optimize startup time.
+TOOL_NO_EXPORTS = 1
+
 include $(LEVEL)/Makefile.common