[PATCH] Fix GCC tests fail for installed toolchain due to ASan, UBSan and TSan testsuites drop GCC_EXEC_PREFIX.

[Maxim Ostapenko <m dot ostapenko at partner dot samsung dot com>]

Hi,

After enabling ASan, TSan and UBSan testsuites for installed toolchain, 
many tests started to fail. This is caused by wrong logic in {asan, 
ubsan, tsan}_finish
functions. Here, restore_ld_library_path is called, that is wrong, 
because it drops some env variables ( GCC_EXEC_PREFIX, LD_LIBRARY_PATH, 
etc) to state that was before gcc-dg.exp initialized testing 
environment, so installed GCC will be confused to find some needed stuff 
later.

Removing restore_ld_library_path from {asan, ubsan, tsan}_finish seems 
to fix the issue.

Tested on x86_64-pc-linux-gnu, ok to commit?

-Maxim

gcc/testsuite/ChangeLog:

2014-10-09  Max Ostapenko  <m.ostapenko@partner.samsung.com>

	* lib/asan-dg.exp (asan_finish): Remove restore_ld_library_path_env_vars.
	* lib/tsan-dg.exp (tsan_finish): Likewise.
	* lib/ubsan-dg.exp (ubsan_finish): Likewise.

diff --git a/gcc/testsuite/lib/asan-dg.exp b/gcc/testsuite/lib/asan-dg.exp
index 9769138..c98fd3c 100644
--- a/gcc/testsuite/lib/asan-dg.exp
+++ b/gcc/testsuite/lib/asan-dg.exp
@@ -132,7 +132,6 @@ proc asan_finish { args } {
 	    unset TEST_ALWAYS_FLAGS
 	}
     }
-    restore_ld_library_path_env_vars
 }
 
 # Symbolize lines like
diff --git a/gcc/testsuite/lib/tsan-dg.exp b/gcc/testsuite/lib/tsan-dg.exp
index 54ec404..6f7a4d9 100644
--- a/gcc/testsuite/lib/tsan-dg.exp
+++ b/gcc/testsuite/lib/tsan-dg.exp
@@ -143,5 +143,4 @@ proc tsan_finish { args } {
     } else {
 	unset dg-do-what-default
     }
-    restore_ld_library_path_env_vars
 }
diff --git a/gcc/testsuite/lib/ubsan-dg.exp b/gcc/testsuite/lib/ubsan-dg.exp
index 5a7a653..87c460f 100644
--- a/gcc/testsuite/lib/ubsan-dg.exp
+++ b/gcc/testsuite/lib/ubsan-dg.exp
@@ -114,5 +114,4 @@ proc ubsan_finish { args } {
 	    unset TEST_ALWAYS_FLAGS
 	}
     }
-    restore_ld_library_path_env_vars
 }