Refactor to remove un-named struct gnu extension usage. Now ISO C89 and C99 compliant. Comment trailing endifs

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@78537 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ashrdi3.c b/lib/ashrdi3.c
index a8125a3..8e27a11 100644
--- a/lib/ashrdi3.c
+++ b/lib/ashrdi3.c
@@ -27,16 +27,16 @@
     input.all = a;
     if (b & bits_in_word)  /* bits_in_word <= b < bits_in_dword */
     {
-        /* result.high = input.high < 0 ? -1 : 0 */
-        result.high = input.high >> (bits_in_word - 1);
-        result.low = input.high >> (b - bits_in_word);
+        /* result.s.high = input.s.high < 0 ? -1 : 0 */
+        result.s.high = input.s.high >> (bits_in_word - 1);
+        result.s.low = input.s.high >> (b - bits_in_word);
     }
     else  /* 0 <= b < bits_in_word */
     {
         if (b == 0)
             return a;
-        result.high  = input.high >> b;
-        result.low = (input.high << (bits_in_word - b)) | (input.low >> b);
+        result.s.high  = input.s.high >> b;
+        result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
     }
     return result.all;
 }