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/quick/arm/utility_arm.cc b/src/compiler/dex/quick/arm/utility_arm.cc
index c689f72..ef0cc72 100644
--- a/src/compiler/dex/quick/arm/utility_arm.cc
+++ b/src/compiler/dex/quick/arm/utility_arm.cc
@@ -16,7 +16,7 @@
 
 #include "arm_lir.h"
 #include "codegen_arm.h"
-#include "compiler/dex/quick/mir_to_lir.h"
+#include "compiler/dex/quick/mir_to_lir-inl.h"
 
 namespace art {