Revert "Make arm64-scratch-register less dexer dependent"

Fails with:
/b/build/slave/angler-armv8-ndebug/build/art/test/626-checker-arm64-scratch-register: FAILED!
 
#################### info
# Regression test checking that the ARM64 scratch register pool is not
# exhausted during moves between stack slots (b/32545705).
#################### diffs
--- expected.txt	2017-01-04 09:57:07.060588086 -0800
+++ output.txt	2017-11-15 15:38:39.610475786 -0800
@@ -1 +1,10 @@
 passed
+error: Assertion could not be matched starting from line 222106
+Smali.smali:1317: ldr s13, pc+580 (addr 0x61c) (100)
+CondA      = z229
+CondB      = z347
+ElseBlockA = B114
+ElseBlockB = B117
+ThenBlockA = B113
+ThenBlockB = B116
+This       = l0
####################
 
626-checker-arm64-scratch-register files deleted from host 
and from target

This reverts commit c82745f2.

Change-Id: I4af4b1ec0b91c59d87b50d73ebc3b183e958bae5