## Compiling an infinite loop results in an infinite loop

Compiling the following simple code for an infinite loop, causes the compiler itself to go into an infinite loop:

```
.funcdef test_loop <()->()>
{
entry():
BRANCH loop()
loop():
BRANCH loop()
}
```

It outputs (on aarch64):

```
...
TRACE - code for test_loop:
TRACE - #0 .globl test_loop define: [] uses: [] pred: [] succ: []
TRACE - #1 .type test_loop, @function define: [] uses: [] pred: [] succ: []
TRACE - #2 test_loop: define: [] uses: [] pred: [] succ: []
TRACE - #3 .globl test_loop define: [] uses: [] pred: [] succ: []
TRACE - #4 .equiv test_loop, test_loop define: [] uses: [] pred: [] succ: []
TRACE - #5 .cfi_sections .eh_frame, .debug_frame define: [] uses: [] pred: [] succ: []
TRACE - #6 .cfi_startproc define: [] uses: [] pred: [] succ: []
TRACE - #7 test_loop.#1010:prologue: define: [] uses: [] pred: [] succ: []
TRACE - #8 STP X29,X30,[SP,#-16]! define: [62] uses: [58, 60, 62] pred: [] succ: [9]
TRACE - #9 MOV X29,SP define: [58] uses: [62] pred: [8] succ: [13]
TRACE - #10 .cfi_def_cfa X29, 16 define: [] uses: [] pred: [] succ: []
TRACE - #11 .cfi_offset X29, -16 define: [] uses: [] pred: [] succ: []
TRACE - #12 .cfi_offset X30, -8 define: [] uses: [] pred: [] succ: []
TRACE - #13 SUB SP,SP,#144 define: [] uses: [] pred: [9] succ: [14]
TRACE - #14 define: [] uses: [58, 38] pred: [13] succ: [15]
TRACE - #15 define: [] uses: [58, 40] pred: [14] succ: [16]
TRACE - #16 define: [] uses: [58, 42] pred: [15] succ: [17]
TRACE - #17 define: [] uses: [58, 44] pred: [16] succ: [18]
TRACE - #18 define: [] uses: [58, 46] pred: [17] succ: [19]
TRACE - #19 define: [] uses: [58, 48] pred: [18] succ: [20]
TRACE - #20 define: [] uses: [58, 50] pred: [19] succ: [21]
TRACE - #21 define: [] uses: [58, 52] pred: [20] succ: [22]
TRACE - #22 define: [] uses: [58, 54] pred: [21] succ: [23]
TRACE - #23 define: [] uses: [58, 56] pred: [22] succ: [24]
TRACE - #24 define: [] uses: [58, 116] pred: [23] succ: [25]
TRACE - #25 define: [] uses: [58, 118] pred: [24] succ: [26]
TRACE - #26 define: [] uses: [58, 120] pred: [25] succ: [27]
TRACE - #27 define: [] uses: [58, 122] pred: [26] succ: [28]
TRACE - #28 define: [] uses: [58, 124] pred: [27] succ: [29]
TRACE - #29 define: [] uses: [58, 126] pred: [28] succ: [30]
TRACE - #30 define: [] uses: [58, 128] pred: [29] succ: [31]
TRACE - #31 define: [] uses: [58, 130] pred: [30] succ: [33]
TRACE - #32 test_loop.__0.entry: define: [] uses: [] pred: [] succ: []
TRACE - #33 B test_loop.__0.loop define: [] uses: [] pred: [31] succ: [35]
TRACE - #34 test_loop.__0.loop: define: [] uses: [] pred: [] succ: []
TRACE - #35 B test_loop.__0.loop define: [] uses: [] pred: [33, 35] succ: [35]
TRACE - #36 .cfi_endproc define: [] uses: [] pred: [] succ: []
TRACE - #37 .globl test_loop:end define: [] uses: [] pred: [] succ: []
TRACE - #38 test_loop:end: define: [] uses: [] pred: [] succ: []
TRACE - #39 .size test_loop, test_loop:end-test_loop define: [] uses: [] pred: [] succ: []
TRACE -
INFO - ---finish---
INFO - ---CompilerPass Peephole Optimization for FuncVer t.#1010 #1010 of Func #1009---
TRACE - #9 MOV X29,SP define: [58] uses: [62] pred: [8] succ: [13]
TRACE - examining first inst 35 of block test_loop.__0.loop
...
```

And on x86-64:

```
...
TRACE - code for test_loop:
TRACE - #0 .globl test_loop define: [] uses: [] pred: [] succ: []
TRACE - #1 test_loop: define: [] uses: [] pred: [] succ: []
TRACE - #2 .globl test_loop define: [] uses: [] pred: [] succ: []
TRACE - #3 .equiv test_loop, test_loop define: [] uses: [] pred: [] succ: []
TRACE - #4 .cfi_startproc define: [] uses: [] pred: [] succ: []
TRACE - #5 test_loop.#1003:prologue: define: [] uses: [] pred: [] succ: []
TRACE - #6 pushq %RBP define: [20] uses: [24, 20] pred: [] succ: [9]
TRACE - #7 .cfi_def_cfa_offset 16 define: [] uses: [] pred: [] succ: []
TRACE - #8 .cfi_offset %RBP, -16 define: [] uses: [] pred: [] succ: []
TRACE - #9 movq %RSP,%RBP define: [24] uses: [20] pred: [6] succ: [11]
TRACE - #10 .cfi_def_cfa_register %RBP define: [] uses: [] pred: [] succ: []
TRACE - #11 addq $-48 ,%rsp define: [] uses: [] pred: [9] succ: [12]
TRACE - #12 define: [] uses: [24, 15] pred: [11] succ: [13]
TRACE - #13 define: [] uses: [24, 52] pred: [12] succ: [14]
TRACE - #14 define: [] uses: [24, 56] pred: [13] succ: [15]
TRACE - #15 define: [] uses: [24, 60] pred: [14] succ: [16]
TRACE - #16 define: [] uses: [24, 64] pred: [15] succ: [18]
TRACE - #17 test_loop.__0.entry: define: [] uses: [] pred: [] succ: []
TRACE - #18 jmp test_loop.__0.loop define: [] uses: [] pred: [16] succ: [20]
TRACE - #19 test_loop.__0.loop: define: [] uses: [] pred: [] succ: []
TRACE - #20 jmp test_loop.__0.loop define: [] uses: [] pred: [18, 20] succ: [20]
TRACE - #21 .cfi_endproc define: [] uses: [] pred: [] succ: []
TRACE - #22 .globl test_loop:end define: [] uses: [] pred: [] succ: []
TRACE - #23 test_loop:end: define: [] uses: [] pred: [] succ: []
TRACE -
INFO - ---finish---
INFO - ---CompilerPass Peephole Optimization for FuncVer t.#1003 #1003 of Func #1001---
TRACE - #9 movq %RSP,%RBP define: [24] uses: [20] pred: [6] succ: [11]
TRACE - examining first inst 20 of block test_loop.__0.loop
...
```

The last line repeats infinitely on both architectures.