Add new configure option, --disable-timestamps, intended to turn off anything which would mess up binary/object comparisons. Currently:

- Disables 'Built on ...' in 'foo --version'.
 - Disables timestamps from being embedded into .dir files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103423 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/CommandLine.cpp

@@ -1170,7 +1170,9 @@ public:
     std::string CPU = sys::getHostCPUName();
     if (CPU == "generic") CPU = "(unknown)";
     OS << ".\n"
+#if (ENABLE_TIMESTAMPS == 1)
        << "  Built " << __DATE__ << " (" << __TIME__ << ").\n"
+#endif
        << "  Host: " << sys::getHostTriple() << '\n'
        << "  Host CPU: " << CPU << '\n'
        << '\n'