mips32/mips64: Fix compiler warnings.

Fix some compiler warnings when compiling Valgrind for mips32/mips64.
Clean up exp files for mips32 BE and LE.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13496 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_libcsetjmp.c b/coregrind/m_libcsetjmp.c
index 9d0d9ba..af47ba0 100644
--- a/coregrind/m_libcsetjmp.c
+++ b/coregrind/m_libcsetjmp.c
@@ -467,7 +467,7 @@
 "   move $v0, $zero             \n\t"  /* Return zero. */
 "   j    $ra                    \n\t"
 "   nop                         \n\t"
-".end VG_MINIMAL_SETJMP;        \n\t"
+".previous                      \n\t"
 "                               \n\t"
 ".globl VG_MINIMAL_LONGJMP;     \n\t"
 ".align 2;                      \n\t"
@@ -492,7 +492,8 @@
 "1:                             \n\t"
 "   move $v0, $a1               \n\t"  /* Return value of second argument. */
 "   j    $ra                    \n\t"
-".end VG_MINIMAL_SETJMP;        \n\t"
+"   nop                         \n\t"
+".previous                      \n\t"
 );
 #endif  /* VGP_mips32_linux */