Added delete() functions to Function and Global. (#20)

Author: harlanhaskins

Sources/LLVM/BasicBlock.swift

@@ -50,7 +50,10 @@ public struct BasicBlock: IRValue, Sequence {
     return BasicBlock(llvm: blockRef)
   }
 
-  /// Removes this basic block from a function and deletes it.
+  /// Deletes the basic block from its containing function.
+  /// - note: This does not remove breaks to this block from the
+  ///         function. Ensure you have removed all insructions that reference
+  ///         this basic block before deleting it.
   public func delete() {
     LLVMDeleteBasicBlock(llvm)
   }

Sources/LLVM/Function.swift

@@ -99,6 +99,14 @@ public class Function: IRValue {
     return BasicBlock(llvm: block)
   }
 
+  /// Deletes the function from its containing module.
+  /// - note: This does not remove calls to this function from the
+  ///         module. Ensure you have removed all insructions that reference
+  ///         this function before deleting it.
+  public func delete() {
+    LLVMDeleteFunction(llvm)
+  }
+
   /// Retrieves the underlying LLVM value object.
   public func asLLVM() -> LLVMValueRef {
     return llvm

Sources/LLVM/Global.swift

@@ -33,6 +33,14 @@ public struct Global: IRValue {
     set { LLVMSetThreadLocal(asLLVM(), newValue.llvm) }
   }
 
+  /// Deletes the global variable from its containing module.
+  /// - note: This does not remove references to this global from the
+  ///         module. Ensure you have removed all insructions that reference
+  ///         this global before deleting it.
+  public func delete() {
+    LLVMDeleteGlobal(llvm)
+  }
+
   /// Retrieves the underlying LLVM value object.
   public func asLLVM() -> LLVMValueRef {
     return llvm