Regression on master, BSOD upon first stage bootup

My personal gcc win dbg build is affected, and the testbots are affected as well.
That regression can't be older than hours or a few days...
see also https://build.reactos.org/#/builders/3/builds/11403 for example

(ntoskrnl/kd/kdio.c:105) -----------------------------------------------------
(ntoskrnl/kd/kdio.c:106) ReactOS 0.4.13-dev (Build 20190707-0.4.13-dev-618-ge489 8e6) (Commit e4898e6e0bd9517233c25f8f862e5a0ae9dce2f1)
(ntoskrnl/kd/kdio.c:107) 1 System Processor [1000 MB Memory]
(ntoskrnl/kd/kdio.c:108) Command Line: NOGUIBOOT KDSERIAL DEBUGPORT=COM1 FIRSTCH ANCE
(ntoskrnl/kd/kdio.c:109) ARC Paths: multi(0)disk(0)cdrom(96) \ multi(0)disk(0)cd rom(96) \reactos\
(ntoskrnl/ke/i386/cpu.c:450) Supported CPU features : KF_V86_VIS KF_RDTSC KF_CR4 KF_CMOV KF_GLOBAL_PAGE KF_LARGE_PAGE KF_MTRR KF_CMPXCHG8B KF_MMX KF_WORKING_PTE KF_PAT KF_FXSR KF_XMMI KF_XMMI64
(ntoskrnl/ke/i386/cpu.c:722) Prefetch Cache: 64 bytes L2 Cache: 2097152 bytesL 2 Cache Line: 64 bytes L2 Cache Associativity: 8
(ntoskrnl/mm/ARM3/mminit.c:1452) HAL I/O Mapping at FFFE0000 is unsafe
(sdk/lib/rtl/image.c:428) Unknown/unsupported fixup type 9.
(sdk/lib/rtl/image.c:430) Address F78DC000, Current 4, Count 132, *TypeOffset 94 81
(sdk/lib/rtl/image.c:505) Error during call to LdrProcessRelocationBlockLongLong ()!
UNRECOVERABLE ERROR: MiReloadBootLoadedDrivers at ntoskrnl/mm/ARM3/sysldr.c:184 7
Relocations failed!

Entered debugger on embedded INT3 at 0x0008:0x8095591e.
kdb:> bt
Eip:
<8095591e>
Frames:
<80a3e123>
<80a32e56>
<80a46af1>
<80a46c75>
<0000000e>

• • • Fatal System Error: 0x0000000a
      (0x0000E4B0,0xFFFFFFFF,0x00000000,0x80976028)