llvmbuild/main.py: Let LibraryDependencies.inc deterministic.

FYI, llvm and clang can be built deterministically between stage 2 and stage3, among iterative clean rebuilds, with GNU ar;

configure --disable-timestamps
make AR.Flags=crsD RANLIB=echo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170682 91177308-0d34-0410-b5e6-96231b3b80d8

utils/llvm-build/llvmbuild/main.py

@@ -182,7 +182,9 @@ def visit_component_info(ci, current_stack, current_set):
         # out easily. If we don't, we should special case the check.
 
         self.ordered_component_infos = []
-        components_to_visit = set(self.component_infos)
+        components_to_visit = sorted(
+            set(self.component_infos),
+            key = lambda c: c.name)
         while components_to_visit:
             visit_component_info(iter(components_to_visit).next(), [], set())