This patch to LLVM is required by the developers of the Extempore language.
The following explanation was posted to the extemporelang@googlegroups.com
mailing list:

"There is an assumption in the parser that all definitions occur within the
same compilation unit - i.e. the parser has local state about what has been
parsed in this unit of work.  Extempore obviously does lots of little units
rather than one big unit and this causes problems for named types that were
defined in another unit - which they always are.  The patch simply checks the
current module to see if the type has been previously defined, and intervenes
appropriately if it has."

Message-ID: <CAOjrPOqoreXuZo4ZpDBvHE7M_tgAR_V8Txq5JFjh1HnGRn2EsA@mail.gmail.com>

--- llvm-3.7.1.src/include/llvm/MC/MCSectionCOFF.h	2015-04-11 12:11:45.000000000 +1000
+++ llvm-3.7.1.src/include/llvm/MC/MCSectionCOFF.h	2015-09-14 09:22:56.000000000 +1000
@@ -16,7 +16,6 @@
 
 #include "llvm/ADT/StringRef.h"
 #include "llvm/MC/MCSection.h"
-#include "llvm/Support/COFF.h"
 
 namespace llvm {
 class MCSymbol;

--- llvm-3.7.1.src/lib/AsmParser/LLParser.cpp	2015-07-11 20:30:36.000000000 +1000
+++ llvm-3.7.1.src/lib/AsmParser/LLParser.cpp	2015-09-14 09:20:57.000000000 +1000
@@ -1754,8 +1754,14 @@
     // If the type hasn't been defined yet, create a forward definition and
     // remember where that forward def'n was seen (in case it never is defined).
     if (!Entry.first) {
-      Entry.first = StructType::create(Context, Lex.getStrVal());
-      Entry.second = Lex.getLoc();
+      // this here for extempore
+      if (M->getTypeByName(Lex.getStrVal())) {
+        Entry.first = M->getTypeByName(Lex.getStrVal());
+        Entry.second = SMLoc();
+      } else {
+        Entry.first = StructType::create(Context, Lex.getStrVal());
+        Entry.second = Lex.getLoc();
+      }
     }
     Result = Entry.first;
     Lex.Lex();

--- llvm-3.7.1.src/lib/CodeGen/TargetLoweringObjectFileImpl.cpp	2015-07-01 05:10:31.000000000 +1000
+++ llvm-3.7.1.src/lib/CodeGen/TargetLoweringObjectFileImpl.cpp	2015-09-14 09:23:40.000000000 +1000
@@ -32,6 +32,7 @@
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbolELF.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Support/COFF.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"

--- llvm-3.7.1.src/lib/ExecutionEngine/MCJIT/MCJIT.cpp	2015-07-31 02:31:16.000000000 +1000
+++ llvm-3.7.1.src/lib/ExecutionEngine/MCJIT/MCJIT.cpp	2015-09-14 09:21:28.000000000 +1000
@@ -524,6 +524,17 @@
         rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
         return rv;
       }
+      if (FTy->getNumParams() == 1 &&
+          RetTy->isVoidTy() &&
+          FTy->getParamType(0)->isPointerTy()) {
+        GenericValue rv;
+        //void (*PF)(char *) = (void(*)(char *))(intptr_t)FPtr;
+        //printf("are symbols available: %d\n",isSymbolSearchingDisabled());
+        void (*PF)(char *) = (void(*)(char *))FPtr;
+        char* mzone = (char*) GVTOP(ArgValues[0]);
+        PF(mzone);
+        return rv;
+      }      
       break;
     }
   }

--- llvm-3.7.1.src/lib/MC/MCContext.cpp	2015-06-23 21:31:32.000000000 +1000
+++ llvm-3.7.1.src/lib/MC/MCContext.cpp	2015-09-14 09:24:01.000000000 +1000
@@ -23,6 +23,7 @@
 #include "llvm/MC/MCSymbolCOFF.h"
 #include "llvm/MC/MCSymbolELF.h"
 #include "llvm/MC/MCSymbolMachO.h"
+#include "llvm/Support/COFF.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"

--- llvm-3.7.1.src/lib/MC/MCObjectFileInfo.cpp	2015-06-25 10:28:42.000000000 +1000
+++ llvm-3.7.1.src/lib/MC/MCObjectFileInfo.cpp	2015-09-14 09:24:17.000000000 +1000
@@ -16,6 +16,7 @@
 #include "llvm/MC/MCSectionCOFF.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionMachO.h"
+#include "llvm/Support/COFF.h"
 using namespace llvm;
 
 static bool useCompactUnwind(const Triple &T) {

--- llvm-3.7.1.src/lib/MC/MCSectionCOFF.cpp	2015-06-09 10:31:39.000000000 +1000
+++ llvm-3.7.1.src/lib/MC/MCSectionCOFF.cpp	2015-09-14 09:24:25.000000000 +1000
@@ -11,6 +11,7 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/COFF.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
--- llvm-3.7.1.src/lib/Target/X86/X86TargetObjectFile.cpp	2015-06-27 04:55:48.000000000 +1000
+++ llvm-3.7.1.src/lib/Target/X86/X86TargetObjectFile.cpp	2015-09-14 09:25:03.000000000 +1000
@@ -16,6 +16,7 @@
 #include "llvm/MC/MCSectionCOFF.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Support/COFF.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Target/TargetLowering.h"