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

[Saleem Abdulrasool]

LGTM with the one inline comment.


================
Comment at: UnwindRegistersSave.S:320
@@ +319,3 @@
+#if __ARM_ARCH_ISA_THUMB1 == 1
+  movs r0, #0        @ return UNW_ESUCCESS
+#else
----------------
A comment to indicate that the non-setting version is not available in T1 would ensure that someone coming along wouldn't try to merge this together.

http://reviews.llvm.org/D7630

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