Revert "[AVR] Fix codegen bug in 16-bit loads"

This reverts commit r351544.

In that commit, I had mistakenly misattributed the issue submitter as
the patch author, Kaushik Phatak.

The patch will be recommitted immediately with the correct attribution.

llvm-svn: 351672
diff --git a/llvm/test/CodeGen/AVR/pseudo/LDWRdPtr-same-src-dst.mir b/llvm/test/CodeGen/AVR/pseudo/LDWRdPtr-same-src-dst.mir
index 3c3a721..4fc97f63 100644
--- a/llvm/test/CodeGen/AVR/pseudo/LDWRdPtr-same-src-dst.mir
+++ b/llvm/test/CodeGen/AVR/pseudo/LDWRdPtr-same-src-dst.mir
@@ -18,9 +18,9 @@
 
     ; CHECK-LABEL: test_ldwrdptr
 
-    ; CHECK:      ld [[SCRATCH:r[0-9]+]], Z
+    ; CHECK:      ld [[SCRATCH:r[0-9]+]], Z+
     ; CHECK-NEXT: push [[SCRATCH]]
-    ; CHECK-NEXT: ldd [[SCRATCH]], Z+1
+    ; CHECK-NEXT: ld [[SCRATCH]], Z
     ; CHECK-NEXT: mov r31, [[SCRATCH]]
     ; CHECK-NEXT: pop r30