Reduce namespace pollution.

This leaves us with just the mspace stuff and three libdex functions to clean
up. We deliberately expose the JII API, and I don't think there's anything we
can really do about the art_..._from_code stuff (and at least that starts with
"art_").

Change-Id: I77e58e8330cd2afeb496642302dfe3311e68091a
diff --git a/src/compiler/codegen/arm/ArmRallocUtil.cc b/src/compiler/codegen/arm/ArmRallocUtil.cc
index 60a5f38..a193a7c 100644
--- a/src/compiler/codegen/arm/ArmRallocUtil.cc
+++ b/src/compiler/codegen/arm/ArmRallocUtil.cc
@@ -15,7 +15,7 @@
  */
 
 /*
- * This file contains Arm-specific register alloction support.
+ * This file contains Arm-specific register allocation support.
  */
 
 #include "../../CompilerUtility.h"
@@ -25,6 +25,8 @@
 #include "Codegen.h"
 #include "../Ralloc.h"
 
+namespace art {
+
 /*
  * Placeholder routine until we do proper register allocation.
  */
@@ -263,7 +265,7 @@
 
 
 /* Return sp-relative offset in bytes using Method* */
-extern int oatVRegOffset(const art::DexFile::CodeItem* code_item,
+extern int oatVRegOffset(const DexFile::CodeItem* code_item,
                          uint32_t core_spills, uint32_t fp_spills,
                          size_t frame_size, int reg)
 {
@@ -337,3 +339,5 @@
     return FPREG(reg) ? &cUnit->regPool->FPRegs[reg & FP_REG_MASK]
                       : &cUnit->regPool->coreRegs[reg];
 }
+
+}  // namespace art