Add a pointer to the owning LLVMContext to Module.  This requires threading LLVMContext through a lot
of the bitcode reader and ASM parser APIs, as well as supporting it in all of the tools.

Patches for Clang and LLVM-GCC to follow.

llvm-svn: 74614
diff --git a/llvm/include/llvm-c/Core.h b/llvm/include/llvm-c/Core.h
index d2d8845..7019b4c 100644
--- a/llvm/include/llvm-c/Core.h
+++ b/llvm/include/llvm-c/Core.h
@@ -47,6 +47,11 @@
 /* Opaque types. */
 
 /**
+ * The top-level container for all LLVM global data.  See the LLVMContext class.
+ */
+typedef struct LLVMCtxt *LLVMContextRef;
+
+/**
  * The top-level container for all other LLVM Intermediate Representation (IR)
  * objects. See the llvm::Module class.
  */
@@ -188,6 +193,10 @@
 
 /*===-- Modules -----------------------------------------------------------===*/
 
+/* Create and destroy contexts. */
+LLVMContextRef LLVMContextCreate();
+void LLVMContextDispose(LLVMContextRef C);
+
 /* Create and destroy modules. */ 
 /** See llvm::Module::Module. */
 LLVMModuleRef LLVMModuleCreateWithName(const char *ModuleID);
@@ -815,6 +824,7 @@
   DEFINE_SIMPLE_CONVERSION_FUNCTIONS(PATypeHolder,       LLVMTypeHandleRef    )
   DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ModuleProvider,     LLVMModuleProviderRef)
   DEFINE_SIMPLE_CONVERSION_FUNCTIONS(MemoryBuffer,       LLVMMemoryBufferRef  )
+  DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LLVMContext,        LLVMContextRef       )
   DEFINE_STDCXX_CONVERSION_FUNCTIONS(PassManagerBase,    LLVMPassManagerRef   )
   
   #undef DEFINE_STDCXX_CONVERSION_FUNCTIONS