ASSERT gbop-test arch_exports.h:2063 extract_branchtype()

This happened once on Appveyor:

https://ci.appveyor.com/project/DynamoRIO/dynamorio/build/1.0.1993

[00:05:02]  65/246 Test  #62: code_api|security-win32.gbop-test ............................***Failed  Required regular expression not found.Regex=[^plain C call
[00:05:02] ?
[00:05:02] res=kernel32_base
[00:05:02] ?
[00:05:02] plain asm call
[00:05:02] ?
[00:05:02] res=kernel32_base
[00:05:02] ?
[00:05:02] pretend on stack
[00:05:02] ?
[00:05:02] exception since not cleaning up stack
[00:05:02] ?
[00:05:02] res=kernel32_base
[00:05:02] ?
[00:05:02] pretend on flushed stack
[00:05:02] ?
[00:05:02] exception since not cleaning up stack
[00:05:02] ?
[00:05:02] res=kernel32_base
[00:05:02] ?
[00:05:02] pretend in image but not after call
[00:05:02] ?
[00:05:02] res=kernel32_base
[00:05:02] ?
[00:05:02] JMP allowed!
[00:05:02] ?
[00:05:02] done
[00:05:02] ?
[00:05:02] $
[00:05:02] ]  0.29 sec
[00:05:02] plain C call
[00:05:02] res=kernel32_base
[00:05:02] plain asm call
[00:05:02] res=kernel32_base
[00:05:02] pretend on stack
[00:05:02] <Application C:\projects\dynamorio\build\build_debug-internal-32\suite\tests\bin\security-win32.gbop-test.exe (2644).  Internal Error: DynamoRIO debug check failure: C:\projects\dynamorio\core\arch\arch_exports.h:2063 false
[00:05:02] (Error occurred @3824 frags)
[00:05:02] version 7.0.17649, custom build
[00:05:02] -no_dynamic_options -code_api -probe_api -msgbox_mask 0 -dumpcore_mask 125 -stderr_mask 12 -stack_size 56K -max_elide_jmp 0 -max_elide_call 0 -no_inline_ignored_syscalls -staged -native_exec_default_list '' -no_native_exec_managed_code -no_indcall2direct -no_aslr_dr -pad_jmps_mark_no_trace 
[00:05:02] 0x1cd8dee8 0x7453ca23
[00:05:02] 0x1cd8e01c 0x7452d640
[00:05:02] 0x1cd8e034 0x7452f3c5
[00:05:02] 0x1cd8e268 0x74536c81
[00:05:02] 0x1cd8ed28 0x7452d6f8
[00:05:02] 0x1cd8ed50 0x7469a34b
[00:05:02] 0x1cd8ef04 0x7451e361
[00:05:02] 0x1cd8eff4 0x1cd2211f
[00:05:02] 0x006df848 0x009a220f
[00:05:02] 0x006df890 0x75567c04
[00:05:02] 0x006df8a4 0x7791ad8f
[00:05:02] 0x006df8ec 0x7791ad5a
[00:05:02] 0x006df8fc 0x00000000>