Prune #includes from llvm/Linker.h and llvm/System/Path.h,
forcing them down into various .cpp files.

This change also:
1. Renames TimeValue::toString() and Path::toString() to ::str()
   for similarity with the STL.
2. Removes all stream insertion support for sys::Path, forcing
   clients to call .str().
3. Removes a use of Config/alloca.h from bugpoint, using smallvector
   instead.
4. Weans llvm-db off <iostream>

sys::Path really needs to be gutted, but I don't have the desire to
do it at this point.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79869 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Path.inc b/lib/System/Win32/Path.inc
index fccf001..46b965f 100644
--- a/lib/System/Win32/Path.inc
+++ b/lib/System/Win32/Path.inc
@@ -808,8 +808,8 @@
   // Can't use CopyFile macro defined in Windows.h because it would mess up the
   // above line.  We use the expansion it would have in a non-UNICODE build.
   if (!::CopyFileA(Src.c_str(), Dest.c_str(), false))
-    return MakeErrMsg(ErrMsg, "Can't copy '" + Src.toString() +
-               "' to '" + Dest.toString() + "': ");
+    return MakeErrMsg(ErrMsg, "Can't copy '" + Src.str() +
+               "' to '" + Dest.str() + "': ");
   return false;
 }