Fix a potential crash bug in keyed calls for non-string keys.

src/arm/ic-arm.cc

Index: src/arm/ic-arm.cc
===================================================================
--- src/arm/ic-arm.cc	(revision 6762)
+++ src/arm/ic-arm.cc	(working copy)
@@ -115,6 +115,9 @@
                                            Register name,
                                            Register scratch1,
                                            Register scratch2) {
+  // Assert that name contains a string.
+  if (FLAG_debug_code) __ AbortIfNotString(name);
+
   // Compute the capacity mask.
   const int kCapacityOffset = StringDictionary::kHeaderSize +
       StringDictionary::kCapacityIndex * kPointerSize;
@@ -843,7 +846,14 @@
   //  -- lr    : return address
   // -----------------------------------
 
+  // Check if the name is a string.
+  Label miss;
+  __ tst(r2, Operand(kSmiTagMask));
+  __ b(eq, &miss);
+  __ IsObjectJSStringType(r2, r0, &miss);
+
   GenerateCallNormal(masm, argc);
+  __ bind(&miss);
   GenerateMiss(masm, argc);
 }