Try renabling test on all platforms

Author: aschwaighofer

test/IRGen/Inputs/huge_c_type.h

@@ -5,7 +5,7 @@ typedef uint8_t bool;
 #define CREATE_ARRAY(T, N)                                                     \
   struct {                                                                     \
     T data[N];                                                                 \
-    size_t size;                                                               \
+    uint64_t size;                                                             \
   }
 
 typedef struct {

test/IRGen/huge_c_type.swift

@@ -3,8 +3,6 @@
 // llvm::IntegerTypes.
 // RUN: %target-swift-frontend -import-objc-header %S/Inputs/huge_c_type.h %s -c
 
-// REQUIRES: OS=macosx || OS=ios
-
 // CHECK-NOT:i9535616
 
 public func doIt(a: Thing3) {