public void setBlock(BasicBlock block, CodeAddress lastAddress) {
      this.block = block;
      this.lastAddress = lastAddress;
    }
Sets the block currently being worked on.

@param block {@code non-null;} the block
@param lastAddress {@code non-null;} code address for the salient last instruction of the
    block
android/android_framework/dex-maker/src/main/java/com/android/dx/dex/code/RopTranslator.java