Comment 9 for bug 1920913

From looking at the in_asm logs, it looks like that instruction starting with 0xebde is executed once with no problem but the second time its changed to 0x0000.

... # First Time
----------------
IN:
0x40126d6880:  ebde f000 ec51  tmy      -0x14000(%r15), 0xde
0x40126d6886:  e3e0 f008 0024  stg      %r14, 8(%r15)
0x40126d688c:  b904 000f       lgr      %r0, %r15
0x40126d6890:  a7fb ffa0       aghi     %r15, -0x60
0x40126d6894:  e300 f000 0024  stg      %r0, 0(%r15)
0x40126d689a:  c438 ffff ff73  lgrl     %r3, 0x40126d6780
0x40126d68a0:  5840 30dc       l        %r4, 0xdc(%r3)
0x40126d68a4:  c248 0000 0008  agfi     %r4, 8
0x40126d68aa:  5040 30dc       st       %r4, 0xdc(%r3)
0x40126d68ae:  c0f4 0000 00d1  jg       0x40126d6a50
PSW=mask 0000000180000000 addr 00000040126d6880 cc  CC_OP_LTGT0_64
R00=0000000000000000 R01=00000040126d6880 R02=00000006296f5d20 R03=00000006296f5d20
R04=000000405f45fcd8 R05=00000006000000e8 R06=0000004012169380 R07=0000004002c410e8
R08=0000004004019000 R09=000000405f2d29d0 R10=0000004002c41048 R11=00000006296095e0
R12=000000400280ec50 R13=0000004002c411d0 R14=00000040126d5c64 R15=0000004002c40e88

... # Second Time
unimplemented opcode 0x0000
----------------
IN:
PSW=mask 0000000180000000 addr 00000040126d6880 cc CC_OP_LTUGTU_32
R00=0000000000001808 R01=00000040126d53c0 R02=00000006296f5d78 R03=00000006296f5d78
R04=000000405f45fcd8 R05=00000006000000f0 R06=0000004012114000 R07=5f9dbb3700003030
R08=0000004004019000 R09=0000000800001808 R10=0000004002c41048 R11=00000006296095e0
R12=000000400280ec50 R13=0000004002c411d0 R14=00000040126d5c64 R15=0000004002c40e88