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

lib/Support/GraphWriter.cpp

@@ -64,9 +64,10 @@ void llvm::DisplayGraph(const sys::Path &Filename, bool wait,
   
   errs() << "Running 'Graphviz' program... ";
   if (sys::Program::ExecuteAndWait(Graphviz, &args[0],0,0,0,0,&ErrMsg))
-     errs() << "Error viewing graph " << Filename << ": " << ErrMsg << "\n";
+    errs() << "Error viewing graph " << Filename.str() << ": " << ErrMsg
+           << "\n";
   else
-     Filename.eraseFromDisk();
+    Filename.eraseFromDisk();
 
 #elif (HAVE_GV && (HAVE_DOT || HAVE_FDP || HAVE_NEATO || \
                    HAVE_TWOPI || HAVE_CIRCO))

lib/Support/SystemUtils.cpp

@@ -15,6 +15,7 @@
 #include "llvm/Support/SystemUtils.h"
 #include "llvm/System/Process.h"
 #include "llvm/System/Program.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 bool llvm::CheckBitcodeOutputToConsole(raw_ostream &stream_to_check,