Avoid int to string conversion in Twine or raw_ostream contexts.

Some output changes from uppercase hex to lowercase hex, no other functionality change intended.

llvm-svn: 321526
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index 79204c6..3a91124 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -1643,7 +1643,7 @@
                 outs() << " <" << TargetName;
                 uint64_t Disp = Target - TargetAddress;
                 if (Disp)
-                  outs() << "+0x" << utohexstr(Disp);
+                  outs() << "+0x" << Twine::utohexstr(Disp);
                 outs() << '>';
               }
             }