[JSC] Remove some invalid immediate instruction forms from ARM64 Air

[JSC] Remove some invalid immediate instruction forms from ARM64 Air
https://bugs.webkit.org/show_bug.cgi?id=153024

Patch by Benjamin Poulain <bpoulain@apple.com> on 2016-01-12
Reviewed by Michael Saboff.

* b3/B3BasicBlock.h:
Export the symbols for testb3.

* b3/air/AirOpcode.opcodes:
We had 2 invalid opcodes:
-Compare with immediate just does not exist.
-Test64 with immediate exists but Air does not recognize
 the valid form of bit-immediates.

* b3/testb3.cpp:
(JSC::B3::genericTestCompare):
(JSC::B3::testCompareImpl):
Extend the tests to cover what was invalid.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@194915 268f45cc-cd09-0410-ab3c-d52691b4dbfc