[Bug 222280] www/firefox: 57.0 crashes clang 5.0 during build

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222280

            Bug ID: 222280
           Summary: www/firefox: 57.0 crashes clang 5.0 during build
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-qa
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-toolchain at FreeBSD.org
          Reporter: jbeich at FreeBSD.org

/usr/bin/c++ -std=gnu++11 -o Compression.o -c
-Iobj-x86_64-unknown-freebsd12.0/dist/system_wrappers -include
config/gcc_hidden.h -DNDEBUG=1 -DTRIMMED=1 -DIMPL_MFBT -Imfbt
-Iobj-x86_64-unknown-freebsd12.0/mfbt 
-Iobj-x86_64-unknown-freebsd12.0/dist/include 
-Iobj-x86_64-unknown-freebsd12.0/dist/include/nspr
-Iobj-x86_64-unknown-freebsd12.0/dist/include/nss       -fPIC  -DMOZILLA_CLIENT
-include obj-x86_64-unknown-freebsd12.0/mozilla-config.h -MD -MP -MF
.deps/Compression.o.pp -Qunused-arguments    -I/usr/local/include
-Qunused-arguments -Wall -Wc++11-compat -Wempty-body -Wignored-qualifiers
-Woverloaded-virtual -Wpointer-arith -Wsign-compare -Wtype-limits
-Wunreachable-code -Wunreachable-code-return -Wwrite-strings
-Wno-invalid-offsetof -Wclass-varargs -Wloop-analysis -Wc++11-compat-pedantic
-Wc++14-compat -Wc++14-compat-pedantic -Wc++1z-compat -Wcomma
-Wimplicit-fallthrough -Wstring-conversion -Wno-inline-new-delete
-Wno-error=deprecated-declarations -Wno-error=array-bounds -Wformat
-Wno-gnu-zero-variadic-macro-arguments -Wformat-security
-Wno-unknown-warning-option -Wno-return-type-c-linkage -fno-exceptions
-fno-strict-aliasing -fno-rtti -fno-exceptions -fno-math-errno -pipe  -O
-fno-omit-frame-pointer   -Wno-error=shadow  -Wno-unused-function
mfbt/Compression.cpp
Assertion failed: (!Old || Old->getCachedLinkage() == D->getCachedLinkage()),
function getLVForDecl, file /usr/src/contrib/llvm/tools/clang/lib/AST/Decl.cpp,
line 1434.
c++: error: unable to execute command: Abort trap
c++: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 5.0.0 (tags/RELEASE_500/final 312559) (based on LLVM
5.0.0svn)
Target: x86_64-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin

Regressed by: https://hg.mozilla.org/mozilla-central/rev/9a4077eda5d8

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