rollup merge of #27676: alexcrichton/msvc-unwind
This commit leverages the runtime support for DWARF exception info added in #27210 to enable unwinding by default on 64-bit MSVC. This also additionally adds a few minor fixes here and there in the test harness and such to get `make check` entirely passing on 64-bit MSVC: * The invocation of `maketest.py` now works with spaces/quotes in CC * debuginfo tests are disabled on MSVC * A link error for librustc was hacked around (see #27438)
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