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/TimeValue.inc b/lib/System/Win32/TimeValue.inc
index 0ca87d4..e37f111 100644
--- a/lib/System/Win32/TimeValue.inc
+++ b/lib/System/Win32/TimeValue.inc
@@ -30,7 +30,7 @@
   return t;
 }
 
-std::string TimeValue::toString() const {
+std::string TimeValue::str() const {
 #ifdef __MINGW32__
   // This ban may be lifted by either:
   // (i) a future MinGW version other than 1.0 inherents the __time64_t type, or