[Issue 21126] New: d_do_test should be built with bootstrap compiler, not compiler being tested

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21126

          Issue ID: 21126
           Summary: d_do_test should be built with bootstrap compiler, not
                    compiler being tested
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

Because otherwise the tests designed to flush out bugs in the compiler being
tested cannot be run. Note how the testing stops dead because of this in this
log file:

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/home/braddr/sandbox/at-client/pull-4135587-Linux_64_64/dmd/generated/linux/release/64/dmd
-conf= -m64 -fPIC -g -lowmem -i -Itools -version=NoMain -odgenerated
-ofgenerated/d_do_test tools/d_do_test.d
Makefile:213: recipe for target 'generated/d_do_test' failed
make[1]: *** [generated/d_do_test] Segmentation fault (core dumped)
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