[JIT] Regalloc cleanup

Remove vestiges of code intended for linear scan register allocation
in the trace compiler.  New plan is to stick with local allocation for
traces and build a new linear scan allocator for the method compiler.

Change-Id: Ic265ab5a7936b144cbe7fa4dc667fa7aba579045
diff --git a/vm/compiler/Frontend.c b/vm/compiler/Frontend.c
index ab04215..c0aa821 100644
--- a/vm/compiler/Frontend.c
+++ b/vm/compiler/Frontend.c
@@ -906,8 +906,8 @@
         dvmCompilerDumpCompilationUnit(&cUnit);
     }
 
-    /* Allocate Registers */
-    dvmCompilerRegAlloc(&cUnit);
+    /* Allocate Registers using simple local allocation scheme */
+    dvmCompilerLocalRegAlloc(&cUnit);
 
     /* Convert MIR to LIR, etc. */
     dvmCompilerMIR2LIR(&cUnit);