[test] Add rudimentary test for transparent bounds checking helpers

Author: lorentey

test/stdlib/RangeContainsInlining.swift

@@ -2,38 +2,37 @@
 // RUN: %target-swift-emit-ir -primary-file %s -O 2>&1 | %FileCheck %s
 // RUN: %target-swift-emit-ir -primary-file %s -Osize 2>&1 | %FileCheck %s
 
-// CHECK-LABEL: define hidden swiftcc i1 @"$s17RangeContainsPerf08halfOpenB0ySbSnySiG_SitF"
-// CHECK-NOT: call swiftcc
-// CHECK: icmp
-// CHECK-NOT: call swiftcc
-// CHECK-LABEL: }
-func halfOpenContains(_ r: Range<Int>, _ i: Int) -> Bool {
-  r.contains(i)
-}
+// We expect calls to `Range.contains`, `ClosedRange.contains` and `~=` over a
+// `Range` instance to result in direct bound comparisons in all compilation
+// modes, including unoptimized builds. (These are often used to implement
+// bounds checking.)
+//
+// The sample functions below use bounds of different integer types to avoid
+// them tail-calling each other.
 
-// CHECK-LABEL: define hidden swiftcc i1 @"$s17RangeContainsPerf06closedB0ySbSNySiG_SitF"
+// CHECK-LABEL: define swiftcc i1 @"$s21RangeContainsInlining08halfOpenB0ySbSnys4Int8VG_ADtF"
 // CHECK-NOT: call swiftcc
 // CHECK: icmp
 // CHECK-NOT: call swiftcc
-// CHECK-LABEL: }
-func closedContains(_ r: ClosedRange<Int>, _ i: Int) -> Bool {
+// CHECK-LABEL: {{^}}}
+public func halfOpenContains(_ r: Range<Int8>, _ i: Int8) -> Bool {
   r.contains(i)
 }
 
-// CHECK-LABEL: define hidden swiftcc i1 @"$s17RangeContainsPerf20halfOpenPatternMatchySbSnySiG_SitF"
+// CHECK-LABEL: define swiftcc i1 @"$s21RangeContainsInlining06closedB0ySbSNys5Int16VG_ADtF"
 // CHECK-NOT: call swiftcc
 // CHECK: icmp
 // CHECK-NOT: call swiftcc
-// CHECK-LABEL: }
-func halfOpenPatternMatch(_ r: Range<Int>, _ i: Int) -> Bool {
-  r ~= i
+// CHECK-LABEL: {{^}}}
+public func closedContains(_ r: ClosedRange<Int16>, _ i: Int16) -> Bool {
+  r.contains(i)
 }
 
-// CHECK-LABEL: define hidden swiftcc i1 @"$s17RangeContainsPerf18closedPatternMatchySbSNySiG_SitF"
+// CHECK-LABEL: define swiftcc i1 @"$s21RangeContainsInlining20halfOpenPatternMatchySbSnys5Int32VG_ADtF"
 // CHECK-NOT: call swiftcc
 // CHECK: icmp
 // CHECK-NOT: call swiftcc
-// CHECK-LABEL: }
-func closedPatternMatch(_ r: ClosedRange<Int>, _ i: Int) -> Bool {
+// CHECK-LABEL: {{^}}}
+public func halfOpenPatternMatch(_ r: Range<Int32>, _ i: Int32) -> Bool {
   r ~= i
 }