fix Issue 17942 - Enums are evaluated differently in global scope

[WalterBright]

No description provided.

[dlang-bot]

Thanks for your pull request, @WalterBright!

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	17942	blocker	Enums are evaluated differently in global scope

[wilzbach]

Interesting AppVeyor is now failing with:

 ... runnable\testpdb.d             -gf   ()
Test failed.  The logged output:
..\generated\Windows\Release\Win32\dmd.exe -conf= -m32mscoff -Irunnable -gf   -L/OPT:NOICF  -odtest_m32mscoff\runnable -oftest_m32mscoff\runnable\testpdb_0.exe  runnable\testpdb.d  -map nul.map
test_m32mscoff\runnable\testpdb_0.exe
core.exception.AssertError@runnable\testpdb.d(77): symbol test15432 not found
----------------
0x00DABED9 in _d_assert_msg
0x00DAAE4A in D main at C:\projects\dmd\test\runnable\testpdb.d(41)
0x00DAE3CF in void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll().__lambda1()
0x00DAE311 in void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll()
0x00DAE0D0 in _d_run_main
0x00DABB34 in __entrypoint.main
0x00DDD23E in __scrt_common_main_seh at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl(253)
0x76D37C04 in BaseThreadInitThunk
0x7761AD8F in RtlInitializeExceptionChain
0x7761AD5A in RtlInitializeExceptionChain
==============================

I restarted it, maybe it's just a spurious one.