Clean up warnings detected by gcc.

Also re-enabled the JIT for the ARMv5te target.

Change-Id: I89fd229205e30e6ee92a4933290a7d8dca001232
diff --git a/vm/compiler/codegen/arm/Codegen.h b/vm/compiler/codegen/arm/Codegen.h
index da65bb5..ca0a843 100644
--- a/vm/compiler/codegen/arm/Codegen.h
+++ b/vm/compiler/codegen/arm/Codegen.h
@@ -25,6 +25,7 @@
 #include "compiler/CompilerIR.h"
 #include "CalloutHelper.h"
 
+#if defined(_CODEGEN_C)
 /*
  * loadConstant() sometimes needs to add a small imm to a pre-existing constant
  */
@@ -44,10 +45,16 @@
 
 static bool genConversionPortable(CompilationUnit *cUnit, MIR *mir);
 
+#if defined(WITH_DEADLOCK_PREDICTION) || defined(WITH_MONITOR_TRACKING) || \
+    defined(__ARM_ARCH_5__)
 static void genMonitorPortable(CompilationUnit *cUnit, MIR *mir);
+#endif
 
 static void genInterpSingleStep(CompilationUnit *cUnit, MIR *mir);
 
+#endif
+
+
 #if defined(WITH_SELF_VERIFICATION)
 /* Self Verification memory instruction decoder */
 void dvmSelfVerificationMemOpDecode(int lr, int* sp);