fixup! [M68k] Fix backwards BTST condition

Add a CodeGen test case for a switch statement that emits BTST

Author: dansalvato

llvm/test/CodeGen/M68k/Bits/btst.ll

@@ -0,0 +1,37 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=m68k-freestanding -verify-machineinstrs | FileCheck %s
+
+define fastcc i16 @test1(i16 %a) nounwind {
+; CHECK-LABEL: test1:
+; CHECK:       ; %bb.0: ; %entry
+; CHECK-NEXT:    move.l %d0, %d1
+; CHECK-NEXT:    and.l #65535, %d1
+; CHECK-NEXT:    sub.l #11, %d1
+; CHECK-NEXT:    bhi .LBB0_3
+; CHECK-NEXT:  ; %bb.1: ; %entry
+; CHECK-NEXT:    and.l #65535, %d0
+; CHECK-NEXT:    move.l #3612, %d1
+; CHECK-NEXT:    btst %d0, %d1
+; CHECK-NEXT:    beq .LBB0_3
+; CHECK-NEXT:  ; %bb.2: ; %match
+; CHECK-NEXT:    moveq #1, %d0
+; CHECK-NEXT:    rts
+; CHECK-NEXT:  .LBB0_3: ; %no_match
+; CHECK-NEXT:    moveq #0, %d0
+; CHECK-NEXT:    rts
+  entry:
+    switch i16 %a, label %no_match [
+      i16 11, label %match
+      i16 10, label %match
+      i16 9, label %match
+      i16 4, label %match
+      i16 3, label %match
+      i16 2, label %match
+    ]
+
+  match:
+    ret i16 1
+
+  no_match:
+    ret i16 0
+}