s390/tishift: Convert __ashlti3(), __ashrti3(), __lshrti3() to C

There is no reason to have __ashlti3(), __ashrti3(), and __lshrti3()
implemented in assembler. Convert them all to C, which allows th

s390/tishift: Convert __ashlti3(), __ashrti3(), __lshrti3() to C

There is no reason to have __ashlti3(), __ashrti3(), and __lshrti3()
implemented in assembler. Convert them all to C, which allows the
compiler to optimize the code if newer instructions allow that.

Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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