allocate new LLVMContext per Lua global state

include/ravi_llvmcodegen.h

@@ -374,7 +374,7 @@ class RAVI_API RaviJITStateImpl : public RaviJITState {
   // map of names to functions
   std::map<std::string, RaviJITFunction *> functions_;
 
-  llvm::LLVMContext &context_;
+  llvm::LLVMContext *context_;
 
   // The triple represents the host target
   std::string triple_;
@@ -420,7 +420,7 @@ public:
   void addGlobalSymbol(const std::string &name, void *address);
 
   virtual void dump();
-  virtual llvm::LLVMContext &context() { return context_; }
+  virtual llvm::LLVMContext &context() { return *context_; }
   LuaLLVMTypes *types() const { return types_; }
   const std::string &triple() const { return triple_; }
   bool is_auto() const { return auto_; }

src/ravi_llvmjit.cpp

@@ -42,7 +42,7 @@ RaviJITState *RaviJITFunctionImpl::owner() const { return owner_; }
 // lua_State - all compilation activity happens
 // in the context of the JIT State
 RaviJITStateImpl::RaviJITStateImpl()
-    : context_(llvm::getGlobalContext()), auto_(false), enabled_(true),
+    : auto_(false), enabled_(true),
       opt_level_(2), size_level_(0), min_code_size_(150), min_exec_count_(50),
       gc_step_(200) {
   // LLVM needs to be initialized else
@@ -64,7 +64,8 @@ RaviJITStateImpl::RaviJITStateImpl()
   // format; LLVM 3.7 onwards COEFF is supported
   triple_ += "-elf";
 #endif
-  types_ = new LuaLLVMTypes(context_);
+  context_ = new llvm::LLVMContext();
+  types_ = new LuaLLVMTypes(*context_);
 }
 
 // Destroy the JIT state freeing up any
@@ -79,6 +80,7 @@ RaviJITStateImpl::~RaviJITStateImpl() {
     delete todelete[i];
   }
   delete types_;
+  delete context_;
 }
 
 void RaviJITStateImpl::addGlobalSymbol(const std::string &name, void *address) {