[ORC] Remove Layer handles from the layer concept.

Handles were returned by addModule and used as keys for removeModule,
findSymbolIn, and emitAndFinalize. Their job is now subsumed by VModuleKeys,
which simplify resource management by providing a consistent handle across all
layers.

llvm-svn: 324700
diff --git a/llvm/include/llvm-c/OrcBindings.h b/llvm/include/llvm-c/OrcBindings.h
index abb3ac6..95bdef8 100644
--- a/llvm/include/llvm-c/OrcBindings.h
+++ b/llvm/include/llvm-c/OrcBindings.h
@@ -31,7 +31,7 @@
 
 typedef struct LLVMOpaqueSharedModule *LLVMSharedModuleRef;
 typedef struct LLVMOrcOpaqueJITStack *LLVMOrcJITStackRef;
-typedef uint32_t LLVMOrcModuleHandle;
+typedef uint64_t LLVMOrcModuleHandle;
 typedef uint64_t LLVMOrcTargetAddress;
 typedef uint64_t (*LLVMOrcSymbolResolverFn)(const char *Name, void *LookupCtx);
 typedef uint64_t (*LLVMOrcLazyCompileCallbackFn)(LLVMOrcJITStackRef JITStack,