Test previdxout.ll fails on macOS

[tgymnich]

Newly added test by @wsmoses fails on macOS.

FAIL: Enzyme :: Enzyme/ReverseMode/previdxout.ll (15 of 668)
******************** TEST 'Enzyme :: Enzyme/ReverseMode/previdxout.ll' FAILED ********************
Script:
--
: 'RUN: at line 1';   /Users/tim/Developer/llvm-project/build/./bin/opt < /Users/tim/Developer/Enzyme/enzyme/test/Enzyme/ReverseMode/previdxout.ll  -load=/Users/tim/Developer/Enzyme/enzyme/build/Enzyme/LLVMEnzyme-12.dylib -enzyme -enzyme-preopt=false -mem2reg -simplifycfg -adce -S | FileCheck /Users/tim/Developer/Enzyme/enzyme/test/Enzyme/ReverseMode/previdxout.ll
: 'RUN: at line 2';   /Users/tim/Developer/llvm-project/build/./bin/opt < /Users/tim/Developer/Enzyme/enzyme/test/Enzyme/ReverseMode/previdxout.ll  -load=/Users/tim/Developer/Enzyme/enzyme/build/Enzyme/LLVMEnzyme-12.dylib -enzyme -enzyme-preopt=false -S | /Users/tim/Developer/llvm-project/build/./bin/lli - | FileCheck /Users/tim/Developer/Enzyme/enzyme/test/Enzyme/ReverseMode/previdxout.ll --check-prefix=EVAL
--
Exit Code: 1

Command Output (stderr):
--
/Users/tim/Developer/Enzyme/enzyme/test/Enzyme/ReverseMode/previdxout.ll:4:9: error: EVAL: expected string not found in input
; EVAL: 1.00
        ^
<stdin>:1:1: note: scanning from here
res=0.000000
^
<stdin>:1:5: note: possible intended match here
res=0.000000
    ^

Input file: <stdin>
Check file: /Users/tim/Developer/Enzyme/enzyme/test/Enzyme/ReverseMode/previdxout.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
           1: res=0.000000
check:4'0     X~~~~~~~~~~~ error: no match found
check:4'1         ?        possible intended match
>>>>>>

--

********************

[wsmoses]

@tgymnich can you investigate why?

[BorisDeletic]

Have also reproduced this bug on macOS Ventura.