Fix simd overlay after previous revert.

jrose-apple · jrose-apple · commit 5bbc879dc8b5 · 2015-06-17T05:19:54.000Z
I guess I missed this configuration, sorry.

Swift SVN r29445
diff --git a/stdlib/public/SDK/simd/simd.swift.gyb b/stdlib/public/SDK/simd/simd.swift.gyb
@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 import Darwin
+@exported import simd
 
 % component = ['x','y','z','w']
 % scalar_types = ['Float','Double','Int32']
