llvm-reduce: Add test for token handling in operands-skip (#133857)

Seems to work correctly but wasn't tested.

Author: arsenm

llvm/test/tools/llvm-reduce/reduce-operands-skip-token.ll

@@ -0,0 +1,27 @@
+; Check token values are correctly handled by operands-skip
+
+; RUN: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-skip --test FileCheck --test-arg --check-prefix=INTERESTING --test-arg %s --test-arg --input-file %s -o %t
+; RUN: FileCheck -check-prefix=RESULT %s < %t
+
+; INTERESTING-LABEL: define void @tokens(
+; INTERESTING: call void @llvm.token.consumer
+
+; RESULT-LABEL: define void @tokens(ptr %ptr) {
+; RESULT-NEXT: %token = call token @llvm.token.producer()
+; RESULT-NEXT:store i32 0, ptr %ptr, align 4
+; RESULT-NEXT:%chain = call token @llvm.token.chain(token %token)
+; RESULT-NEXT:call void @llvm.token.consumer(token %token)
+; RESULT-NEXT:store i32 1, ptr %ptr, align 4
+; RESULT-NEXT:ret void
+define void @tokens(ptr %ptr) {
+  %token = call token @llvm.token.producer()
+  store i32 0, ptr %ptr
+  %chain = call token @llvm.token.chain(token %token)
+  call void @llvm.token.consumer(token %chain) ; -> rewrite to use %token directly
+  store i32 1, ptr %ptr
+  ret void
+}
+
+declare token @llvm.token.producer()
+declare token @llvm.token.chain(token)
+declare void @llvm.token.consumer(token)