[Bug 246274] 11.2-STABLE/i386 to 11.3-STABLE/i386 buildworld fails: clang Abort trap

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246274

            Bug ID: 246274
           Summary: 11.2-STABLE/i386 to 11.3-STABLE/i386 buildworld fails:
                    clang Abort trap
           Product: Base System
           Version: 11.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: eugen at freebsd.org

Created attachment 214222
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214222&action=edit
make NO_CLEAN=yes buildworld

I've tried routinely perform source upgrade of 11.2-STABLE/i386 r341008
(clang6) upto stable/11/i386 r360772. The build fails at "stage 3: cross
tools":

Building
/home/obj/home/src/tmp/home/src/lib/clang/libllvm/Target/AArch64/MCTargetDesc/AArch64InstPrinter.o
c++: error: unable to execute command: Abort trap (core dumped)
c++: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM
6.0.1)

This is the same with and without CPUTYPE?=core2 in /etc/make.conf; with and
without following in /etc/src.conf:

WITHOUT_LLVM_TARGET_ALL=
WITH_LLVM_TARGET_X86=
WITHOUT_CLANG_FULL=

See attached files for full build log and generated debugging info.

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