Let -B work for ld paths on Linux.

llvm-svn: 140604
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index b11fc89..8cfe859 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -1696,8 +1696,8 @@
   // FIXME: This is in here to find crt1.o. It is provided by libc, and
   // libc (like gcc), can be installed in any directory. Once we are
   // fetching this from a config file, we should have a libc prefix.
-  Paths.push_back("/lib/../" + Lib);
-  Paths.push_back("/usr/lib/../" + Lib);
+  Paths.push_back("=/lib/../" + Lib);
+  Paths.push_back("=/usr/lib/../" + Lib);
 
   if (!Suffix.empty())
     Paths.push_back(Base);