The fix for JDK-8258134 has broken the build on Windows:

    "void __cdecl vec_spill_helper(class CodeBuffer *,bool,int,int,unsigned int,class outputStream *)" (?vec_spill_helper@@YAXPEAVCodeBuffer@@_NHHIPEAVoutputStream@@@Z)
...\hotspot\variant-server\libjvm\gtest\jvm.dll : fatal error LNK1120: 1 unresolved externals
* For target hotspot_variant-server_libjvm_objs_BUILD_LIBJVM_link:
   Creating library ...\hotspot\variant-server\libjvm\objs\jvm.lib and object ...\hotspot\variant-server\libjvm\objs\jvm.exp
zBarrierSetAssembler_x86.obj : error LNK2019: unresolved external symbol "int __cdecl vec_spill_helper(class CodeBuffer *,bool,int,int,unsigned int,class outputStream *)" (?vec_spill_helper@@YAHPEAVCodeBuffer@@_NHHIPEAVoutputStream@@@Z) referenced in function "public: __cdecl ZSaveLiveRegisters::ZSaveLiveRegisters(class MacroAssembler *,class ZLoadBarrierStubC2 *)" (??0ZSaveLiveRegisters@@QEAA@PEAVMacroAssembler@@PEAVZLoadBarrierStubC2@@@Z)
  Hint on symbols that are defined and could potentially match:
    "void __cdecl vec_spill_helper(class CodeBuffer *,bool,int,int,unsigned int,class outputStream *)" (?vec_spill_helper@@YAXPEAVCodeBuffer@@_NHHIPEAVoutputStream@@@Z)
...\support\modules_libs\java.base\server\jvm.dll : fatal error LNK1120: 1 unresolved externals