[PATCH v2 02/10] MIPS: Actually decode JALX in `__compute_return_epc_for_insn'

Complement commit fb6883e5809c ("MIPS: microMIPS: Support handling of 
delay slots.") and actually decode the regular MIPS JALX major 
instruction opcode, the handling of which has been added with the said 
commit for EPC calculation in `__compute_return_epc_for_insn'.

Cc: stable@vger.kernel.org # 3.9+
Fixes: fb6883e5809c ("MIPS: microMIPS: Support handling of delay slots.")
Signed-off-by: Maciej W. Rozycki <redacted>
---
Unchanged from v1.

linux-mips-epc-jalx.diff
Index: linux-sfr-test/arch/mips/kernel/branch.c
===================================================================

--- linux-sfr-test.orig/arch/mips/kernel/branch.c	2017-06-01 03:32:07.000000000 +0100
+++ linux-sfr-test/arch/mips/kernel/branch.c	2017-06-01 03:38:34.417710000 +0100

@@ -556,6 +556,7 @@ int __compute_return_epc_for_insn(struct
 	/*
 	 * These are unconditional and in j_format.
 	 */
+	case jalx_op:
 	case jal_op:
 		regs->regs[31] = regs->cp0_epc + 8;
 	case j_op: