Perf tweaks to compiling and oat writing.

Make hot quick compiler routines inlinable.
Remove computation/use of SSA strings.
Use vector insert when writing to the end of a vector in the output stream, to
avoid a memset followed by a memcpy.

Generating boot.oat/art these changes improve performance by around 2.5%.

Change-Id: I3d0bdb01333efe8f0eda4bdf97225e0b307f934d
diff --git a/src/compiler/dex/mir_optimization.cc b/src/compiler/dex/mir_optimization.cc
index 74b13fe..d9c443e 100644
--- a/src/compiler/dex/mir_optimization.cc
+++ b/src/compiler/dex/mir_optimization.cc
@@ -16,7 +16,7 @@
 
 #include "compiler_internals.h"
 #include "local_value_numbering.h"
-#include "dataflow_iterator.h"
+#include "dataflow_iterator-inl.h"
 
 namespace art {