[Bug 253226] C++ demangling of simple types broken after libcxxrt update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253226

            Bug ID: 253226
           Summary: C++ demangling of simple types broken after libcxxrt
                    update
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: arichardson at FreeBSD.org

The most recent update to libcxxrt (a7941b3326a38f203dab0b92a51e549499081a08)
has broken demangling for basic types: This can be seen by the
googletest/gmock_main/gmock-matchers_test:main test failing after that commit:

For example i is not longer demangle to int and n no longer prints unsigned
short: 

Expected: 1 fatal failure containing "Value of: n
Expected: is > 10
  Actual: 5 (of type unsigned short)"
  Actual:
/local/scratch/alr48/cheri/freebsd/contrib/googletest/googlemock/test/gmock-matchers_test.cc:3179:
Fatal failure:
Value of: n
Expected: is > 10
  Actual: 5 (of type t)

Expected: 1 non-fatal failure containing "Value of: 5
Expected: is > 5
  Actual: 5 (of type int)"
  Actual:
/local/scratch/alr48/cheri/freebsd/contrib/googletest/googlemock/test/gmock-matchers_test.cc:3233:
Non-fatal failure:
Value of: 5
Expected: is > 5
  Actual: 5 (of type i)

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