Port some GC fixes from the bleeding edge to the 2.3 branch. These are:...

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
===================================================================
--- src/arm/macro-assembler-arm.cc	(revision 5701)
+++ src/arm/macro-assembler-arm.cc	(working copy)
@@ -906,6 +906,17 @@
                                         Register scratch2,
                                         Label* gc_required,
                                         AllocationFlags flags) {
+  if (!FLAG_inline_new) {
+    if (FLAG_debug_code) {
+      // Trash the registers to simulate an allocation failure.
+      mov(result, Operand(0x7091));
+      mov(scratch1, Operand(0x7191));
+      mov(scratch2, Operand(0x7291));
+    }
+    jmp(gc_required);
+    return;
+  }
+
   ASSERT(!result.is(scratch1));
   ASSERT(!scratch1.is(scratch2));
 
@@ -957,6 +968,17 @@
                                         Register scratch2,
                                         Label* gc_required,
                                         AllocationFlags flags) {
+  if (!FLAG_inline_new) {
+    if (FLAG_debug_code) {
+      // Trash the registers to simulate an allocation failure.
+      mov(result, Operand(0x7091));
+      mov(scratch1, Operand(0x7191));
+      mov(scratch2, Operand(0x7291));
+    }
+    jmp(gc_required);
+    return;
+  }
+
   ASSERT(!result.is(scratch1));
   ASSERT(!scratch1.is(scratch2));