test: require asserts and sanity check stats content

Author: tomershafir

llvm/test/tools/llc/save-stats.ll

@@ -1,8 +1,14 @@
-; RUN: rm -f %t.stats && llc -mtriple=arm64-apple-macosx --save-stats=obj -o %t.s %s && test -f %t.stats
-; RUN: rm -f %{t:stem}.tmp.stats && llc -mtriple=arm64-apple-macosx --save-stats=cwd -o %t.s %s && test -f %{t:stem}.tmp.stats
-; RUN: rm -f %{t:stem}.tmp.stats && llc -mtriple=arm64-apple-macosx --save-stats -o %t.s %s && test -f %{t:stem}.tmp.stats
+; REQUIRES: asserts
+
+; RUN: llc -mtriple=arm64-apple-macosx --save-stats=obj -o %t.s %s && cat %t.stats | FileCheck %s
+; RUN: llc -mtriple=arm64-apple-macosx --save-stats=cwd -o %t.s %s && cat %{t:stem}.tmp.stats | FileCheck %s
+; RUN: llc -mtriple=arm64-apple-macosx --save-stats -o %t.s %s && cat %{t:stem}.tmp.stats | FileCheck %s
 ; RUN: not llc -mtriple=arm64-apple-macosx --save-stats=invalid -o %t.s %s 2>&1 | FileCheck %s --check-prefix=INVALID_ARG
 
+; CHECK: {
+; CHECK: "asm-printer.EmittedInsts":
+; CHECK: }
+
 ; INVALID_ARG: {{.*}}llc{{.*}}: for the --save-stats option: Cannot find option named 'invalid'!
 define i32 @func() {
   ret i32 0