s390: Add missing extended mnemonics

s390: Add missing extended mnemonics

Add extended mnemonics specified in the z/Architecture Principles of
Operation [1] and z/Architecture Reference Summary [2], that were
previously missing from the opcode table.

The following added extended mnemonics are synonyms to a base mnemonic
and therefore disassemble into their base mnemonic:
jc, jcth, lfi, llgfi, llghi

The following added extended mnemonics are more specific than their base
mnemonic and therefore disassemble into the added extended mnemonic:
risbhgz, risblgz, rnsbgt, rosbgt, rxsbgt

The following added extended mnemonics are more specific than their base
mnemonic, but disassemble into their base mnemonic due to design
constraints:
notr, notgr

The missing extended mnemonic jl* conditional jump long flavors cannot
be added, as they would clash with the existing non-standard extended
mnemonic j* conditional jump flavors jle and jlh. The missing extended
mnemonic jlc jump long conditional is not added, as the related jl*
flavors cannot be added.
Note that these missing jl* conditional jump long flavors are already
defined as non-standard jg* flavors instead. While the related missing
extended mnemonic jlc could be added as non-standard jgc instead it is
forgone in favor of not adding further non-standard mnemonics.

The missing extended mnemonics sllhh, sllhl, slllh, srlhh, srlhl, and
srllh cannot be implemented using the current design, as they require
computed operands. For that reason the following missing extended
mnemonics are not added as well, as they fall into the same category of
instructions that operate on high and low words of registers. They
should better be added together, not to confuse the user, which of those
instructions are currently implemented or not.
lhhr, lhlr, llhfr, llchhr, llchlr, llclhr, llhhhr, llhhlr, llhlhr,
nhhr, nhlr, nlhr, ohhr, ohlr, olhr, xhhr, xhlr, xlhr

[1] IBM z/Architecture Principles of Operation, SA22-7832-13, IBM z16,
    https://publibfp.dhe.ibm.com/epubs/pdf/a227832d.pdf
[2] IBM z/Architecture Reference Summary, SA22-7871-11,
    https://www.ibm.com/support/pages/sites/default/files/2022-09/SA22-7871-11.pdf

opcodes/
	* s390-opc.c: Define operand formats R_CP16_28, U6_18, and
	  U5_27. Define instruction formats RIE_RRUUU3, RIE_RRUUU4,
	  and RRF_R0RR4.
	* s390-opc.txt: Add extended mnemonics jc, jcth, lfi, llgfi,
	  llghi, notgr, notr, risbhgz, risblgz, rnsbgt, rosbgt, and
	  rxsbgt.

gas/
	* config/tc-s390.c: Add support to insert operand for format
	  R_CP16_28, reusing existing logic for format V_CP16_12.
	* testsuite/gas/s390/esa-g5.s: Add test for extended mnemonic
	  jc.
	* testsuite/gas/s390/esa-g5.d: Likewise.
	* testsuite/gas/s390/zarch-z900.s: Add test for extended
	  mnemonic llghi.
	* testsuite/gas/s390/zarch-z900.d: Likewise.
	* testsuite/gas/s390/zarch-z9-109.s: Add tests for extended
	  mnemonics lfi and llgfi.
	* testsuite/gas/s390/zarch-z9-109.d: Likewise.
	* testsuite/gas/s390/zarch-z10.s: Add tests for extended
	  mnemonics rnsbgt, rosbgt, and rxsbgt.
	* testsuite/gas/s390/zarch-z10.d: Likewise.
	* testsuite/gas/s390/zarch-z196.s: Add tests for extended
	  mnemonics jcth, risbhgz, and risblgz.
	* testsuite/gas/s390/zarch-z196.d: Likewise.
	* testsuite/gas/s390/zarch-arch13.s: Add tests for extended
	  mnemonics notr and notgr.
	* testsuite/gas/s390/zarch-arch13.d: Likewise.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Andreas Krebbel <krebbel@linux.ibm.com>