[NFC] add testcase for MinimumJumpTableEntries change on PowerPC.

Author: Chen Zheng

llvm/test/CodeGen/PowerPC/jump-table.ll

@@ -0,0 +1,41 @@
+; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu -stop-after=finalize-isel \
+; RUN: | FileCheck %s
+; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64-ibm-aix -stop-after=finalize-isel \
+; RUN: | FileCheck %s
+; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc-ibm-aix -stop-after=finalize-isel \
+; RUN: | FileCheck %s
+
+; CHECK:   jumpTable:
+; CHECK-NEXT:   kind:            label-difference32
+; CHECK-NEXT:   entries:
+; CHECK-NEXT:     - id:              0
+
+define signext i32 @jt(i32 signext %a, i32 signext %b) {
+entry:
+  switch i32 %a, label %sw.epilog [
+    i32 15, label %return
+    i32 12, label %sw.bb1
+    i32 19, label %sw.bb2
+    i32 27, label %sw.bb3
+    i32 31, label %sw.bb4
+  ]
+
+sw.bb1:                                           ; preds = %entry
+  br label %return
+
+sw.bb2:                                           ; preds = %entry
+  br label %return
+
+sw.bb3:                                           ; preds = %entry
+  br label %return
+
+sw.bb4:                                           ; preds = %entry
+  br label %return
+
+sw.epilog:                                        ; preds = %entry
+  br label %return
+
+return:                                           ; preds = %entry, %sw.epilog, %sw.bb4, %sw.bb3, %sw.bb2, %sw.bb1
+  %retval.0 = phi i32 [ 0, %sw.epilog ], [ 51, %sw.bb4 ], [ 49, %sw.bb3 ], [ 48, %sw.bb2 ], [ 46, %sw.bb1 ], [ 45, %entry ]
+  ret i32 %retval.0
+}