Turn ASSERT(!rn.is(ip)) into CHECK so the error can be caught in release mode...

src/assembler-arm.cc

Index: src/assembler-arm.cc
===================================================================
--- src/assembler-arm.cc	(revision 805)
+++ src/assembler-arm.cc	(working copy)
@@ -554,7 +554,7 @@
       // However, if the original instruction is a 'mov rd, x' (not setting the
       // condition code), then replace it with a 'ldr rd, [pc]'
       RecordRelocInfo(x.rmode_, x.imm32_);
-      ASSERT(!rn.is(ip));  // rn should never be ip, or will be trashed
+      CHECK(!rn.is(ip));  // rn should never be ip, or will be trashed
       Condition cond = static_cast<Condition>(instr & CondMask);
       if ((instr & ~CondMask) == 13*B21) {  // mov, S not set
         ldr(rd, MemOperand(pc, 0), cond);