CallConv causes SIGSEGV with --disable-tables-next-to-code

When building with --disable-tables-next-to-code on OpenBSD-amd64 testsuite/tests/codeGen/should_run/CallConv.hs seems to not be using the right calling convention. The continuation address pointed at by %rbp is not sensible in this case.

(gdb) bt
#0  0x0000000000354048 in someFuncF ()
#1  0x0000000000000000 in ?? ()
(gdb) disassemble
Dump of assembler code for function someFuncF:
=> 0x0000000000354048 <+0>:	movss  %xmm1,%xmm0
   0x000000000035404c <+4>:	subss  %xmm2,%xmm0
   0x0000000000354050 <+8>:	addss  %xmm2,%xmm1
   0x0000000000354054 <+12>:	movss  %xmm0,%xmm2
   0x0000000000354058 <+16>:	movss  %xmm3,%xmm0
   0x000000000035405c <+20>:	divss  %xmm4,%xmm0
   0x0000000000354060 <+24>:	mulss  %xmm4,%xmm3
   0x0000000000354064 <+28>:	movss  %xmm0,%xmm4
   0x0000000000354068 <+32>:	jmpq   *0x0(%rbp)
End of assembler dump.
(gdb) p/x $rbp
$1 = 0x2af505330
(gdb) p/x *((uint64_t*) $rbp)
$2 = 0x6882c0
(gdb) disassemble 0x00000000006882c0
No function contains specified address.
(gdb) c
Program received signal SIGSEGV, Segmentation fault.
0x00000000006882c0 in ?? ()

I guess this assembly code relies on TNTC and so the test should be made conditional on that setting.