cpu,opcodes,gas: fix arguments to ldabs and ldind eBPF instructions

The eBPF non-generic load instructions ldind{b,h,w,dw} and
ldabs{b,h,w,dw} do not take an explicit destination register as an
argument.  Instead, they put the loaded value in %r0, implicitly.

This patch fixes the CPU BPF description to not expect a 'dst'
argument in these arguments, regenerates the corresponding files in
opcodes, and updates the impacted GAS tests.

Tested in a x86-64 host.

cpu/ChangeLog:

2019-07-14  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* bpf.cpu (dlsi): ldabs and ldind instructions do not take an
	explicit 'dst' argument.

opcodes/ChangeLog:

2019-07-14  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* bpf-desc.c: Regenerate.
	* bpf-opc.c: Likewise.

gas/ChangeLog:

2019-07-14  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* testsuite/gas/bpf/mem.s: Do not use explicit arguments for
	ldabs and ldind instructions.
	* testsuite/gas/bpf/mem.d: Updated accordingly.
	* testsuite/gas/bpf/mem-be.d: Likewise.

cpu/ChangeLog

@@ -1,3 +1,8 @@
+2019-07-14  Jose E. Marchesi  <jose.marchesi@oracle.com>
+
+	* bpf.cpu (dlsi): ldabs and ldind instructions do not take an
+	explicit 'dst' argument.
+
 2019-06-13  Stafford Horne  <shorne@gmail.com>
 
 	* or1korfpx.cpu (float-setflag-insn-base): Add 'sf' to symbol.

cpu/bpf.cpu

@@ -477,8 +477,8 @@
   (dni (.sym x-basename x-suffix x-endian)
        (.str x-basename x-suffix)
        ((ISA (.sym ebpf x-endian)))
-       (.str x-basename x-suffix " $dst" x-endian ",$src" x-endian ",$imm32")
-       (+ imm32 (f-offset16 0) (.sym src x-endian) (.sym dst x-endian)
+       (.str x-basename x-suffix " $src" x-endian ",$imm32")
+       (+ imm32 (f-offset16 0) ((.sym f-dst x-endian) 0) (.sym src x-endian)
           (.sym OP_CLASS_ x-class) (.sym OP_SIZE_ x-size)
           (.sym OP_MODE_ x-mode)) () ()))