Micro-optimize these functions in the case where they are not inlined.

llvm-svn: 91316
diff --git a/llvm/lib/Support/raw_ostream.cpp b/llvm/lib/Support/raw_ostream.cpp
index 31451cc..0c90e77 100644
--- a/llvm/lib/Support/raw_ostream.cpp
+++ b/llvm/lib/Support/raw_ostream.cpp
@@ -209,8 +209,7 @@
 }
 
 raw_ostream &raw_ostream::operator<<(double N) {
-  this->operator<<(ftostr(N));
-  return *this;
+  return this->operator<<(ftostr(N));
 }