Request for reviews (XS): 6876584 for HS16

[Vladimir Kozlov]

It is clean up after 6875866 changes pushed to HS16 yesterday.

http://cr.openjdk.java.net/~kvn/6876584/webrev.00

Fixed 6876584: parameters order is incorrect for enc_String_Equals() in x86_32.ad

Fixed parameters order for enc_String_Equals(),
I forgot to fix it in 6875866.
Fixed typo in the comments in 6875866 changes.
Used shrq/addq in enc_String_IndexOf() in x86_64.ad
to be consistent with following code.
Added required /othervm to the 6875866 test.