tests: adapt the character_literals test

and re-enable it

https://bugs.swift.org/browse/SR-5064

Author: eeckstein

test/SILOptimizer/character_literals.swift

@@ -1,35 +1,25 @@
 // RUN: %target-swift-frontend -parse-as-library -O -emit-ir  %s | %FileCheck %s
 // REQUIRES: swift_stdlib_no_asserts,optimized_stdlib,CPU=x86_64
 
-// see https://bugs.swift.org/browse/SR-5064, rdar://32511377
-// XFAIL: *
-
 // This is an end-to-end test to ensure that the optimizer generates
 // a simple literal for character literals.
 
 // CHECK-LABEL: define {{.*}}charArray
-// CHECK-NOT: {{^}}[^ ]
-// CHECK:       store i64 9223372036854775649, i64*
-// CHECK-NOT: {{^}}[^ ]
-// CHECK:       store i64 9223372036854775650, i64*
-// CHECK-NOT: {{^}}[^ ]
-// CHECK:       store i64 9223372036854775651, i64*
-// CHECK-NOT: {{^}}[^ ]
-// CHECK:       store i64 9223372036854775652, i64*
-// CHECK-NOT: {{^}}[^ ]
-// CHECK:       ret
+// CHECK:  store <2 x i64> <i64 -159, i64 -158>
+// CHECK:  store <2 x i64> <i64 -157, i64 -156>
+// CHECK:  ret
 public func charArray(_ i: Int) -> [Character] {
   return [ "a", "b", "c", "d" ]
 }
 
 // CHECK-LABEL: define {{.*}}singleChar
-// CHECK: ret {{.*}} 9223372036854775649
+// CHECK: ret {{.*}} -159
 public func singleChar() -> Character {
   return "a"
 }
 
 // CHECK-LABEL: define {{.*}}singleNonAsciiChar
-// CHECK: ret {{.*}} 9223372036848850918
+// CHECK: ret {{.*}} -5924890
 public func singleNonAsciiChar() -> Character {
   return "日"
 }