Output .size directives to tell the assembler the size of each function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22381 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ATTAsmPrinter.cpp

@@ -53,6 +53,7 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
       printMachineInstruction(II);
     }
   }
+  O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
 
   // We didn't modify anything.
   return false;