[PATCH] Use a consistent generator's name for cmake invocations

[Simon Atanasyan]

Hi,

When I try to cross-compile LLVM using cmake+ninja the process fails
on building a native TableGen. The build.ninja file generated by cmake
invokes cmake again without -G option. As a result cmake uses a
default generator and creates Makefile instead of build.ninja for
building native TableGen.

The attached patch passes -G argument to cmake with the same
generator's name as used for the initial cmake invocation.

I'm not an expert in cmake, so could anybody review the patch before commit?

Regards,
Simon Atanasyan
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