Fix for a possible bug in RegExp stack guard.

src/arm/regexp-macro-assembler-arm.cc

Index: src/arm/regexp-macro-assembler-arm.cc
diff --git a/src/arm/regexp-macro-assembler-arm.cc b/src/arm/regexp-macro-assembler-arm.cc
index 81645c72eac8c32aca1901c014bc578a8724f013..cd76edbf15e7ad2d5a76d2f21397a4eff86067f7 100644
--- a/src/arm/regexp-macro-assembler-arm.cc
+++ b/src/arm/regexp-macro-assembler-arm.cc
@@ -1049,7 +1049,7 @@ int RegExpMacroAssemblerARM::CheckStackGuardState(Address* return_address,
   MaybeObject* result = Execution::HandleStackGuardInterrupt();
 
   if (*code_handle != re_code) {  // Return address no longer valid
-    int delta = *code_handle - re_code;
+    int delta = code_handle->address() - re_code->address();
     // Overwrite the return address on the stack.
     *return_address += delta;
   }