[AVR] Marm MIR test functions as tracking liveness information

This fixes an assertion error that broke three tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294140 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Dylan McKay

test/CodeGen/AVR/pseudo/LDDWRdPtrQ.mir

@@ -12,6 +12,7 @@
 
 ---
 name:            test_lddwrdptrq
+tracksRegLiveness: true
 body: |
   bb.0.entry:
 
@@ -20,5 +21,5 @@ body: |
     ; CHECK:      ldd     r30, Y+10
     ; CHECK-NEXT: ldd     r31, Y+11
 
-    early-clobber %r31r30 = LDDWRdPtrQ %r29r28, 10
+    early-clobber %r31r30 = LDDWRdPtrQ undef %r29r28, 10
 ...

test/CodeGen/AVR/pseudo/LDDWRdYQ.mir

@@ -12,6 +12,7 @@
 
 ---
 name:            test_lddwrdyq
+tracksRegLiveness: true
 body: |
   bb.0.entry:
 
@@ -20,5 +21,5 @@ body: |
     ; CHECK:      ldd     r30, Y+1
     ; CHECK-NEXT: ldd     r31, Y+2
 
-    early-clobber %r31r30 = LDDWRdYQ %r29r28, 1
+    early-clobber %r31r30 = LDDWRdYQ undef %r29r28, 1
 ...