[PATCH] Make the unwinder build on thumbv6-m with the integrated assembler.

[Saleem Abdulrasool]

================
Comment at: UnwindRegistersSave.S:310
@@ -309,2 +309,3 @@
   str r3, [r0, #60]  @ store return address as pc
+  movs r0, #0        @ return UNW_ESUCCESS
 #else
----------------
How about doing:

    #if __ARM_ARCH_ISA_THUMB == 1
      movs r0, #0
    #else
      mov r0, #0
    #endif

I don't see why we should have the side-effect if we can avoid it.

http://reviews.llvm.org/D7630

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