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Skip COMDAT sections when parsing COFF

Fixes https://code.google.com/p/chromium/issues/detail?id=339889
when building Clang-based ASan on Windows

Change-Id: Ib77d9593636f46827dbb77f087d407ec0f463fc7

--- a/build/make/obj_int_extract.c

+++ b/build/make/obj_int_extract.c

@@ -666,7 +666,11 @@

     }

     strcpy(sectionlist[i], sectionname);

-    if (!strcmp(sectionname, ".rdata")) sectionrawdata_ptr = get_le32(ptr + 20);

+    // check if it's .rdata and is not a COMDAT section.

+    if (!strcmp(sectionname, ".rdata") &&

+        (get_le32(ptr + 36) & 0x1000) == 0) {

+      sectionrawdata_ptr = get_le32(ptr + 20);

+    }

     ptr += 40;

   }