Revert "Remove de-initializers that dispose of LLVM objects" (#81)

This reverts commit e5c6e6c.

Author: CodaFi

Sources/LLVM/IRBuilder.swift

@@ -1706,8 +1706,7 @@ public class IRBuilder {
     return Alias(llvm: LLVMAddAlias(module.llvm, type.asLLVM(), aliasee.asLLVM(), name))
   }
 
-  // FIXME: Re-introduce this when disposal becomes safe.
-//  deinit {
-//    LLVMDisposeBuilder(llvm)
-//  }
+  deinit {
+    LLVMDisposeBuilder(llvm)
+  }
 }

Sources/LLVM/Module.swift

@@ -193,10 +193,9 @@ public final class Module: CustomStringConvertible {
     return String(cString: cStr)
   }
 
-  // FIXME: Re-introduce this when disposal becomes safe.
-//  deinit {
-//    LLVMDisposeModule(llvm)
-//  }
+  deinit {
+    LLVMDisposeModule(llvm)
+  }
 }
 
 extension Bool {

Sources/LLVM/TargetMachine.swift

@@ -212,8 +212,7 @@ public class TargetMachine {
     return MemoryBuffer(llvm: llvm)
   }
 
-  // FIXME: Re-introduce this when disposal becomes safe.
-//  deinit {
-//    LLVMDisposeTargetMachine(llvm)
-//  }
+  deinit {
+    LLVMDisposeTargetMachine(llvm)
+  }
 }