Upgrade our copy of clang and llvm to 3.5.1 release. This is a bugfix

only release, no new features have been added.

Please note that this version requires C++11 support to build; see
UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.5.1/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.5.1/tools/clang/docs/ReleaseNotes.html>

MFC after:	1 month
X-MFC-With:	276479

1 files changed, 31 insertions, 0 deletions

diff --git a/contrib/llvm/patches/patch-11-add-llvm-gvn-option.diff b/contrib/llvm/patches/patch-11-add-llvm-gvn-option.diff
new file mode 100644
index 0000000..fcd051f
--- /dev/null
+++ b/contrib/llvm/patches/patch-11-add-llvm-gvn-option.diff
@@ -0,0 +1,31 @@
+Add an llvm option to enable/disable running the global value numbering
+optimization pass.  Disabling this pass helps to minimize the size of
+boot2.
+
+Introduced here: http://svnweb.freebsd.org/changeset/base/274968
+
+Index: lib/Transforms/IPO/PassManagerBuilder.cpp
+===================================================================
+--- lib/Transforms/IPO/PassManagerBuilder.cpp
++++ lib/Transforms/IPO/PassManagerBuilder.cpp
+@@ -57,6 +57,10 @@ static cl::opt<bool> RunLoadCombine("combine-loads
+                                     cl::Hidden,
+                                     cl::desc("Run the load combining pass"));
+ 
++static cl::opt<bool> RunGVN("enable-gvn", cl::init(true),
++                            cl::Hidden,
++                            cl::desc("Run the global value numbering pass"));
++
+ PassManagerBuilder::PassManagerBuilder() {
+     OptLevel = 2;
+     SizeLevel = 0;
+@@ -210,7 +214,8 @@ void PassManagerBuilder::populateModulePassManager
+ 
+   if (OptLevel > 1) {
+     MPM.add(createMergedLoadStoreMotionPass()); // Merge load/stores in diamond
+-    MPM.add(createGVNPass());                 // Remove redundancies
++    if (RunGVN)
++      MPM.add(createGVNPass());                 // Remove redundancies
+   }
+   MPM.add(createMemCpyOptPass());             // Remove memcpy / form memset
+   MPM.add(createSCCPPass());                  // Constant prop with SCCP