[test] Update generic_casts_swift4 for new mangling prefix

Author: hamishknight

test/SILGen/generic_casts_swift4.swift

@@ -5,58 +5,58 @@
 // behaviour when casting to an archetype – the compiler assumes a non-optional
 // archetype is non-optional, and therefore can unwrap the source.
 
-// CHECK-LABEL: sil hidden @$S13generic_casts32optional_any_to_opaque_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts32optional_any_to_opaque_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_to_opaque_archetype<T>(_ x: Any?) -> T {
   return x as! T
   // CHECK: bb0([[RET:%.*]] : @trivial $*T, {{%.*}} : @trivial $*Optional<Any>):
   // CHECK: unconditional_checked_cast_addr Any in {{%.*}} : $*Any to T in [[RET]] : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts46optional_any_conditionally_to_opaque_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts46optional_any_conditionally_to_opaque_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_conditionally_to_opaque_archetype<T>(_ x: Any?) -> T? {
   return x as? T
   // CHECK: checked_cast_addr_br take_always Any in {{%.*}} : $*Any to T in {{%.*}} : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts32optional_any_is_opaque_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts32optional_any_is_opaque_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_is_opaque_archetype<T>(_ x: Any?, _: T) -> Bool {
   return x is T
   // CHECK: checked_cast_addr_br take_always Any in {{%.*}} : $*Any to T in {{%.*}} : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts016optional_any_to_C17_opaque_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts016optional_any_to_C17_opaque_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_to_optional_opaque_archetype<T>(_ x: Any?) -> T? {
   return x as! T?
   // CHECK: unconditional_checked_cast_addr Any in {{%.*}} : $*Any to T in {{%.*}} : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts030optional_any_conditionally_to_C17_opaque_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts030optional_any_conditionally_to_C17_opaque_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_conditionally_to_optional_opaque_archetype<T>(_ x: Any?) -> T?? {
   return x as? T?
   // CHECK: checked_cast_addr_br take_always Any in {{%.*}} : $*Any to T in {{%.*}} : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts016optional_any_is_C17_opaque_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts016optional_any_is_C17_opaque_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_is_optional_opaque_archetype<T>(_ x: Any?, _: T) -> Bool {
   return x is T?
   //   Because the levels of optional are the same, 'is' doesn't transform into an 'as?',
   //   so we just cast directly without digging into the optional operand.
   // CHECK: checked_cast_addr_br take_always Optional<Any> in {{%.*}} : $*Optional<Any> to Optional<T> in {{%.*}} : $*Optional<T>
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts31optional_any_to_class_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts31optional_any_to_class_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_to_class_archetype<T : AnyObject>(_ x: Any?) -> T {
   return x as! T
   // CHECK: unconditional_checked_cast_addr Any in {{%.*}} : $*Any to T in {{%.*}} : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts45optional_any_conditionally_to_class_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts45optional_any_conditionally_to_class_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_conditionally_to_class_archetype<T : AnyObject>(_ x: Any?) -> T? {
   return x as? T
   // CHECK: checked_cast_addr_br take_always Any in {{%.*}} : $*Any to T in {{%.*}} : $*T
 }
 
-// CHECK-LABEL: sil hidden @$S13generic_casts31optional_any_is_class_archetype{{[_0-9a-zA-Z]*}}F
+// CHECK-LABEL: sil hidden @$s13generic_casts31optional_any_is_class_archetype{{[_0-9a-zA-Z]*}}F
 func optional_any_is_class_archetype<T : AnyObject>(_ x: Any?, _: T) -> Bool {
   return x is T
   // CHECK: checked_cast_addr_br take_always Any in {{%.*}} : $*Any to T in {{%.*}} : $*T