[LLVMdev] [PATCH] MSVC: Allow choosing different CRT for different build types

[nobled]

This patch splits LLVM_USE_CRT into new CMake variables
LLVM_USE_CRT_DEBUG, LLVM_USE_CRT_RELEASE, etc (one for each build
type). It also automatically detects which CRT was already chosen by
CMake's defaults in the CMAKE_CXX_FLAGS_* variables, and defaults to
those values.

(Before, it was using add_llvm_definitions(), which worked...somehow,
but CMAKE_CXX_FLAGS_RELEASE and friends were still defining their own
CRT flag. Now it edits the FLAGS variables instead.)
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