Large number of tests failing - 64bit LDC with MSVC - Append Operator

[kinke via digitalmars-d-ldc]

> Yay!  Also, what timing!

Pure coincidence, but that append operator issue on Win64 was the 
initial reason for that PR. ;)
What LLVM commit are you using? I'm using yesterday's release_36 
head and exception handling on Win64 is sadly broken again, 
causing a myriad of failing tests.

I can confirm the /LARGEADDRESSAWARE:NO issue.

Wrt. running the tests: I often find myself taking a shortcut and 
running only the debug tests to reduce the required time 
considerably; phobos2-ldc-unittest takes a very long time, 
especially std.algorithm. You can disable the release tests by 
editing runtime\CTestTestfile.cmake in your build directory. 
Delete the first 6 non-comment lines and then all tests from 
core.atomic (new line 7, first druntime release test) to (but 
obviously excluding) core.atomic-debug (more or less at the 
center of the file).
dmd-testsuite doesn't compile as it requires the make build 
system, so you don't need to edit tests\d2\CTestTestfile.cmake in 
a similar way.
Beware that these ctest files get rebuilt as soon as your local 
LDC git head changes!