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/usr/src/gcc-5/debian/patches/gcc-linaro-revert-r234665.diff is in gcc-5-source 5.3.1-14ubuntu2.

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Index: gcc/testsuite/gcc.target/aarch64/simd/pr67896.C
===================================================================
--- a/src/gcc/testsuite/gcc.target/aarch64/simd/pr67896.C	(revision 234665)
+++ b/src/gcc/testsuite/gcc.target/aarch64/simd/pr67896.C	(nonexistent)
@@ -1,7 +0,0 @@
-typedef __Poly8_t A;
-typedef __Poly16_t A; /* { dg-error "conflicting declaration" } */
-typedef __Poly64_t A; /* { dg-error "conflicting declaration" } */
-typedef __Poly128_t A; /* { dg-error "conflicting declaration" } */
-
-typedef __Poly8x8_t B;
-typedef __Poly16x8_t B; /* { dg-error "conflicting declaration" } */ 
Index: gcc/config/aarch64/aarch64-builtins.c
===================================================================
--- a/src/gcc/config/aarch64/aarch64-builtins.c	(revision 234665)
+++ b/src/gcc/config/aarch64/aarch64-builtins.c	(revision 234660)
@@ -629,16 +629,14 @@
       enum machine_mode mode = aarch64_simd_types[i].mode;
 
       if (aarch64_simd_types[i].itype == NULL)
-	{
-	  aarch64_simd_types[i].itype
-	    = build_distinct_type_copy
-	      (build_vector_type (eltype, GET_MODE_NUNITS (mode)));
-	  SET_TYPE_STRUCTURAL_EQUALITY (aarch64_simd_types[i].itype);
-	}
+	aarch64_simd_types[i].itype =
+	  build_distinct_type_copy
+	    (build_vector_type (eltype, GET_MODE_NUNITS (mode)));
 
       tdecl = add_builtin_type (aarch64_simd_types[i].name,
 				aarch64_simd_types[i].itype);
       TYPE_NAME (aarch64_simd_types[i].itype) = tdecl;
+      SET_TYPE_STRUCTURAL_EQUALITY (aarch64_simd_types[i].itype);
     }
 
 #define AARCH64_BUILD_SIGNED_TYPE(mode)  \