[arm] Remove embedded constant pool support.

src/arm/frames-arm.cc

Index: src/arm/frames-arm.cc
diff --git a/src/arm/frames-arm.cc b/src/arm/frames-arm.cc
index b1139bacc40f87039f53ad1ecf7e2d119e09d770..8529bb541c2640e654ba638731570ce9bd160ee4 100644
--- a/src/arm/frames-arm.cc
+++ b/src/arm/frames-arm.cc
@@ -20,16 +20,16 @@ namespace internal {
 Register JavaScriptFrame::fp_register() { return v8::internal::fp; }
 Register JavaScriptFrame::context_register() { return cp; }
 Register JavaScriptFrame::constant_pool_pointer_register() {
-  DCHECK(FLAG_enable_embedded_constant_pool);
-  return pp;
+  UNREACHABLE();
+  return no_reg;
 }
 
 
 Register StubFailureTrampolineFrame::fp_register() { return v8::internal::fp; }
 Register StubFailureTrampolineFrame::context_register() { return cp; }
 Register StubFailureTrampolineFrame::constant_pool_pointer_register() {
-  DCHECK(FLAG_enable_embedded_constant_pool);
-  return pp;
+  UNREACHABLE();
+  return no_reg;
 }