MachO: look for nearby tools on all MachO platforms.

This brings "-arch armv7m" (etc) behaviour more in line with what's expected
for developers on OS X, and allows Clang to find an "ld" (for example) in the
same directory instead of using the default /usr/bin/ld.

Unfortunately no test because it relies on the specific place Clang is running
from.

rdar://problem/16427320

llvm-svn: 209437
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index c082902..5f9b19c 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -45,6 +45,14 @@
 MachO::MachO(const Driver &D, const llvm::Triple &Triple,
                        const ArgList &Args)
   : ToolChain(D, Triple, Args) {
+  getProgramPaths().push_back(getDriver().getInstalledDir());
+  if (getDriver().getInstalledDir() != getDriver().Dir)
+    getProgramPaths().push_back(getDriver().Dir);
+
+  // We expect 'as', 'ld', etc. to be adjacent to our install dir.
+  getProgramPaths().push_back(getDriver().getInstalledDir());
+  if (getDriver().getInstalledDir() != getDriver().Dir)
+    getProgramPaths().push_back(getDriver().Dir);
 }
 
 /// Darwin - Darwin tool chain for i386 and x86_64.
@@ -232,14 +240,6 @@
 DarwinClang::DarwinClang(const Driver &D, const llvm::Triple& Triple,
                          const ArgList &Args)
   : Darwin(D, Triple, Args) {
-  getProgramPaths().push_back(getDriver().getInstalledDir());
-  if (getDriver().getInstalledDir() != getDriver().Dir)
-    getProgramPaths().push_back(getDriver().Dir);
-
-  // We expect 'as', 'ld', etc. to be adjacent to our install dir.
-  getProgramPaths().push_back(getDriver().getInstalledDir());
-  if (getDriver().getInstalledDir() != getDriver().Dir)
-    getProgramPaths().push_back(getDriver().Dir);
 }
 
 void DarwinClang::addClangWarningOptions(ArgStringList &CC1Args) const {