llvm: add patch from upstream to fix build on linux with --enable-shared.

See http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140616/222509.html

srcpkgs/llvm/patches/enable-shared-build-fix.patch

@@ -0,0 +1,26 @@
+diff --git a/include/llvm/IR/LegacyPassNameParser.h b/include/llvm/IR/LegacyPassNameParser.h
+index e2e4912..a07e3fd 100644
+--- include/llvm/IR/LegacyPassNameParser.h
++++ include/llvm/IR/LegacyPassNameParser.h
+@@ -95,6 +95,8 @@ private:
+   }
+ };
+ 
++EXTERN_TEMPLATE_INSTANTIATION(class cl::parser<const PassInfo *>);
++
+ ///===----------------------------------------------------------------------===//
+ /// FilteredPassNameParser class - Make use of the pass registration
+ /// mechanism to automatically add a command line argument to opt for
+diff --git a/lib/IR/Pass.cpp b/lib/IR/Pass.cpp
+index 91d86ae..00ce223 100644
+--- lib/IR/Pass.cpp
++++ lib/IR/Pass.cpp
+@@ -234,6 +234,8 @@ PassNameParser::~PassNameParser() {
+   // attempting to remove the registration listener is an error.
+ }
+ 
++TEMPLATE_INSTANTIATION(class cl::parser<const PassInfo *>);
++
+ //===----------------------------------------------------------------------===//
+ //   AnalysisUsage Class Implementation
+ //