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[PATCH, rs6000] Fix many powerpc*-linux ASAN test suite failures

With a recent libsanitizer merge from upstream, we're now seeing a lot
of ASAN test suite failures with the following error:

  ==26426==ASan runtime does not come first in initial library list; you should
  either link runtime to your application or manually preload it with LD_PRELOAD.

This is caused by powerpc*-linux not defining LIBASAN_EARLY_SPEC which is
defined in gnu-user.h.  It looks like all *-linux architectures include
gnu-user.h except for powerpc*-linux.  The following patch makes powerpc*-linux
match the other linux architectures... and fixes a compiler error when we
try to redefine CC1_SPEC.

This passed bootstrap and regtesting on powerpc64-linux with no regressions.
Ok for mainline?


	* config.gcc (powerpc*-*-linux*): Include gnu-user.h in tm_file.
	* config/rs6000/sysv4.h (CC!_SPEC): Undefine it before defining it.

Index: gcc/config.gcc
--- gcc/config.gcc	(revision 212572)
+++ gcc/config.gcc	(working copy)
@@ -2243,7 +2243,7 @@ powerpc-*-rtems*)
 	tmake_file="${tmake_file} rs6000/t-fprules rs6000/t-rtems rs6000/t-ppccomm"
-	tm_file="${tm_file} dbxelf.h elfos.h freebsd-spec.h rs6000/sysv4.h"
+	tm_file="${tm_file} dbxelf.h elfos.h gnu-user.h freebsd-spec.h rs6000/sysv4.h"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="rs6000/t-fprules rs6000/t-ppcos ${tmake_file} rs6000/t-ppccomm"
 	extra_objs="$extra_objs rs6000-linux.o"
Index: gcc/config/rs6000/sysv4.h
--- gcc/config/rs6000/sysv4.h	(revision 212572)
+++ gcc/config/rs6000/sysv4.h	(working copy)
@@ -539,6 +539,7 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEF
 /* Pass -G xxx to the compiler.  */
+#undef CC1_SPEC
 #define	CC1_SPEC "%{G*} %(cc1_cpu)" \
 "%{meabi: %{!mcall-*: -mcall-sysv }} \
 %{!meabi: %{!mno-eabi: \

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