[InstCombine] [NFC] Added more tests for unlocked IO transformation

llvm/trunk/test/Transforms/InstCombine/unlocked-stdio.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instcombine -S -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
 
 %struct._IO_FILE = type { i32, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, %struct._IO_marker*, %struct._IO_FILE*, i32, i32, i64, i16, i8, [1 x i8], i8*, i64, i8*, i8*, i8*, i8*, i64, i32, [20 x i8] }
 %struct._IO_marker = type { %struct._IO_marker*, %struct._IO_FILE*, i32 }
 
 @.str = private unnamed_addr constant [5 x i8] c"file\00", align 1
 @.str.1 = private unnamed_addr constant [2 x i8] c"w\00", align 1
 @.str.2 = private unnamed_addr constant [4 x i8] c"str\00", align 1
+@stdout = external global %struct._IO_FILE*, align 8
 @global_file = common global %struct._IO_FILE* null, align 8
 
 define void @external_fgetc_test(%struct._IO_FILE* %f) {
 ; CHECK-LABEL: @external_fgetc_test(
 ; CHECK-NEXT:    [[CALL:%.*]] = call i32 @fgetc(%struct._IO_FILE* [[F:%.*]])
 ; CHECK-NEXT:    ret void
 ;
   %call = call i32 @fgetc(%struct._IO_FILE* %f)
;
   %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0)) #2
   %.cast = ptrtoint %struct._IO_FILE* %call to i64
   store i64 %.cast, i64* bitcast (%struct._IO_FILE** @global_file to i64*), align 8
   %call1 = call i64 @fwrite(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* %call)
   %call2 = call i32 @fclose(%struct._IO_FILE* %call) #2
   ret void
 }
 
+define void @test_captured_by_standard_stream(i8* nocapture readonly %s) {
+; CHECK-LABEL: @test_captured_by_standard_stream(
+; CHECK-NEXT:    [[CALL:%.*]] = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
+; CHECK-NEXT:    [[TMP:%.*]] = load %struct._IO_FILE*, %struct._IO_FILE** @stdout, align 8
+; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @fputs(i8* [[S:%.*]], %struct._IO_FILE* [[TMP]])
+; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @fclose(%struct._IO_FILE* [[TMP]])
+; CHECK-NEXT:    ret void
+;
+  %call = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
+  %tmp = load %struct._IO_FILE*, %struct._IO_FILE** @stdout, align 8
+  %call1 = tail call i32 @fputs(i8* %s, %struct._IO_FILE* %tmp)
+  %call2 = tail call i32 @fclose(%struct._IO_FILE* %tmp)
+  ret void
+}
 
+define void @test_captured_by_arg(i8* nocapture readonly %s, %struct._IO_FILE* nocapture %file) {
+; CHECK-LABEL: @test_captured_by_arg(
+; CHECK-NEXT:    [[CALL:%.*]] = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
+; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @fputs(i8* [[S:%.*]], %struct._IO_FILE* [[FILE:%.*]])
+; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @fclose(%struct._IO_FILE* [[FILE]])
+; CHECK-NEXT:    ret void
+;
+  %call = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
+  %call1 = tail call i32 @fputs(i8* %s, %struct._IO_FILE* %file)
+  %call2 = tail call i32 @fclose(%struct._IO_FILE* %file)
+  ret void
+}
 
-declare i64 @fwrite(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture) #0
-declare i64 @fread(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture) #0
-declare i32 @fputs(i8* nocapture readonly, %struct._IO_FILE* nocapture) #0
-declare i8* @fgets(i8*, i32, %struct._IO_FILE* nocapture) #0
+declare i64 @fwrite(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture)
+declare i64 @fread(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture)
+declare i32 @fputs(i8* nocapture readonly, %struct._IO_FILE* nocapture)
+declare i8* @fgets(i8*, i32, %struct._IO_FILE* nocapture)