Remove ObjRefInitBlk test due to gc hole (#91906)

src/tests/JIT/Regression/JitBlue/GitHub_21761/GitHub_21761.il

@@ -217,32 +217,6 @@ FAIL:
  ret
 }
 
-// Non-zero initialization of a GC reference is not exactly a valid scenario.
-// Still, the JIT shouldn't end up generating invalid IR (non-zero GC typed
-// constant nodes).
-
-.class sequential sealed Pair extends [System.Runtime]System.ValueType
-{
- .field public int64 Key
- .field public class [System.Runtime]System.Object Value
-}
-
-.method static bool ObjRefInitBlk() cil managed noinlining
-{
- .locals init (valuetype Pair a)
-
- ldloca a
- ldc.i4 1
- sizeof Pair
- initblk
-
- ldloca a
- ldind.i8
- ldc.i8 0x0101010101010101
- ceq
- ret
-}
-
 // Non-zero SIMD constants are not supported so field by field initialization
 // should not be attempted.
 
@@ -310,9 +284,6 @@ FAIL:
  call bool Float32NaNInitBlk()
  brfalse FAIL
 
- call bool ObjRefInitBlk()
- brfalse FAIL
-
  call bool SimdInitBlk()
  brfalse FAIL