[AArch64] Change a test to use a generic instr instead of a target specific one.

Target specific instructions have requirements that are not compatible
with what we want to test here. Namely, target specific instructions
must have their operands properly mapped on register classes.

llvm-svn: 290379

llvm/test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir

@@ -219,7 +219,7 @@ body: |
 
     %0 = LDRWui killed %x0, 0 :: (load 4 from %ir.src)
     %5(s32) = COPY %0
-    %1 = COPY %x1
+    %1(p0) = COPY %x1
     %2 = COPY %w2
     TBNZW killed %2, 0, %bb.2.end
 
@@ -229,7 +229,7 @@ body: |
 
   bb.2.end:
     %4(s32) = PHI %0, %bb.0.entry, %3, %bb.1.then
-    STRWui killed %4, killed %1, 0 :: (store 4 into %ir.dst)
+    G_STORE killed %4, killed %1 :: (store 4 into %ir.dst)
     RET_ReallyLR
 ...