Restore a tiny bit of functionality that I completely overlooked in the
Linux toolchain selection -- sorry folks. =] This should fix the Hexagon
toolchain.

However, I would point out that I see why my testing didn't catch this
-- we have no tests for Hexagon. ;]

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148977 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 6a4e0b3..7c26a0e 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1663,7 +1663,10 @@
       TC = new toolchains::Minix(*this, Target);
       break;
     case llvm::Triple::Linux:
-      TC = new toolchains::Linux(*this, Target);
+      if (Target.getArch() == llvm::Triple::hexagon)
+        TC = new toolchains::Hexagon_TC(*this, Target);
+      else
+        TC = new toolchains::Linux(*this, Target);
       break;
     case llvm::Triple::Win32:
       TC = new toolchains::Windows(*this, Target);