Add lit test for implicit defs of physical registers

Author: JL2210

llvm/test/TableGen/GlobalISelEmitter-implicit-defs.td

@@ -0,0 +1,13 @@
+// RUN: llvm-tblgen -gen-global-isel -warn-on-skipped-patterns -I %p/../../include -I %p/Common %s -o /dev/null 2>&1 < %s | FileCheck %s
+
+include "llvm/Target/Target.td"
+include "GlobalISelEmitterCommon.td"
+
+// CHECK-NOT: Skipped pattern: Src pattern result has 1 def(s) without the HasNoUse predicate set to true but Dst MI has no def
+// CHECK: Skipped pattern: Pattern defines a physical register
+let Uses = [B0], Defs = [B0] in
+def tst1 : I<(outs), (ins), [(set B0, (add B0, 1))]>;
+
+// CHECK: Skipped pattern: Src pattern result has 1 def(s) without the HasNoUse predicate set to true but Dst MI has no def
+let Uses = [B0] in
+def tst2 : I<(outs), (ins), [(set B0, (add B0, 1))]>;