[rfc] add support routines required for gcc-4.9

[Adrian Chadd]

-adrian
The following is neded for gcc-4.9, as it doesn't supply these inline functions.

What do people think?

adrian at lucy-11i386:~/work/freebsd/head-embedded-2/src % svn diff
sys/conf/files.mips
Index: sys/conf/files.mips
===================================================================
--- sys/conf/files.mips (revision 284394)
+++ sys/conf/files.mips (working copy)
@@ -61,6 +61,9 @@
 libkern/memmove.c                      standard
 libkern/cmpdi2.c                       optional        mips | mipsel
 libkern/ucmpdi2.c                      optional        mips | mipsel
+# required for gcc-4.9?
+libkern/ashldi3.c                      standard
+libkern/ashrdi3.c                      standard

 # cfe support
 dev/cfe/cfe_api.c                      optional        cfe

-adrian