RFR(S): 8248901: Signed immediate support in .../share/assembler.hpp is broken.

[Patric Hedlin]

Dear all,

I would like to ask for help to review the following change/update:

Issue:  https://bugs.openjdk.java.net/browse/JDK-8248901
Webrev: http://cr.openjdk.java.net/~phedlin/tr8248901/


Current definition(s) of is_simm() and friends are not robust over 
inputs. Both min and max values are undefined for width > 32 (and width 
< 0).
No is_uimm() is currently provided (added). Several definitions are not 
used (cleanup).

NOTE: Adding currently unused is_simm9() and is_uimm12(), required by 
JDK-8247766.


Testing: hs-tier1-3


Best regards,
Patric