Changes

AArch64: Handle shift amount 0

This code fixes shiftHelper() in AArch64 codegen.
It generates a mov instruction when the shift amount is 0 and the
reference count of the first child of a shift node is larger than 1.

Signed-off-by: KONNO Kazuhiro <konno@jp.ibm.com>
 (commit: 721d05f)