Begin refactoring to use the newly added triple predicates for
simplicity. Also addresses a FIXME, although not one that could be
observed.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150294 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 716e78d..00f8c1b 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -2001,12 +2001,7 @@
   // to the link paths.
   path_list &Paths = getFilePaths();
 
-  const bool Is32Bits = (Arch == llvm::Triple::x86 ||
-                         Arch == llvm::Triple::mips ||
-                         Arch == llvm::Triple::mipsel ||
-                         Arch == llvm::Triple::ppc);
-
-  const std::string Multilib = Is32Bits ? "lib32" : "lib64";
+  const std::string Multilib = Triple.isArch32Bit() ? "lib32" : "lib64";
   const std::string MultiarchTriple = getMultiarchTriple(Triple, SysRoot);
 
   // Add the multilib suffixed paths where they are available.