[llvm] SystemZ: Implement copyPhysReg between vr128 and gr128 (PR #90616)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

I got an error with the verifier on this test case. Fixed with:

```
diff --git a/llvm/test/CodeGen/SystemZ/copy-phys-reg-gr128-to-vr128.mir b/llvm/test/CodeGen/SystemZ/copy-phys-reg-gr128-to-vr128.mir
index a2a07ac5c7f5..6711da657481 100644
--- a/llvm/test/CodeGen/SystemZ/copy-phys-reg-gr128-to-vr128.mir
+++ b/llvm/test/CodeGen/SystemZ/copy-phys-reg-gr128-to-vr128.mir
@@ -51,9 +51,9 @@ name:            copy_gr128_to_vr128__r0q_to_v0_subreg0
 tracksRegLiveness: true
 body:             |
   bb.0:
-    liveins: $r0d
+    liveins: $r0q
     ; CHECK-LABEL: name: copy_gr128_to_vr128__r0q_to_v0_subreg0
-    ; CHECK: liveins: $r0d
+    ; CHECK: liveins: $r0q
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: $v0 = VLVGP $r0d, $r1d
     ; CHECK-NEXT: Return implicit $v0
@@ -66,9 +66,9 @@ name:            copy_gr128_to_vr128__r0q_to_v0_subreg1
 tracksRegLiveness: true
 body:             |
   bb.0:
-    liveins: $r1d
+    liveins: $r0q
     ; CHECK-LABEL: name: copy_gr128_to_vr128__r0q_to_v0_subreg1
-    ; CHECK: liveins: $r1d
+    ; CHECK: liveins: $r0q
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: $v0 = VLVGP $r0d, $r1d
     ; CHECK-NEXT: Return implicit $v0

```
ok to commit?

https://github.com/llvm/llvm-project/pull/90616