[Issue 21813] New: [REG-master] Bootstrap broken from dmd-cxx baseline.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21813

          Issue ID: 21813
           Summary: [REG-master] Bootstrap broken from dmd-cxx baseline.
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

First noticed in https://github.com/dlang/dmd/pull/12405 

Confirmed that it's master that broke it in
https://github.com/dlang/dmd/pull/12407

ICE when compiling dmd is:
-----------------------------------------------------------
src/dmd/target.d(122):        called from here: defaultTargetOS()
dmd: statement.c:290: ErrorStatement::ErrorStatement(): Assertion
`global.gaggedErrors || global.errors' failed.

posix.mak:107: recipe for target 'dmd' failed

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