[PATCH] Fix compilation under MinGW

[Anton Yartsev]

Hi all,

tried to build LLVM with MinGW64 for the first time in a long period. 
The build ended up with:

llvm[0]: Compiling raw_ostream.cpp for Debug+Asserts build
f:/llvm_COMMON/lib/Support/raw_ostream.cpp: In member function 
'llvm::raw_ostream& llvm::raw_ostream::operator<<(double)':
f:/llvm_COMMON/lib/Support/raw_ostream.cpp:230:24: error: '_fpclass' was 
not declared in this scope
f:/llvm_COMMON/lib/Support/raw_ostream.cpp:233:15: error: '_FPCLASS_NZ' 
was not declared in this scope

As I understand the problem is that MinGW case is not considered 
properly: MinGW also defines _WIN32 but has no _fpclass.
Unfortunately I do not know if the code under '#ifdef _WIN32' should be 
included in MinGW case or not.
The breaking code was committed as r127872 in early 2011 by chapuni.

Please review and apply (I have no commit access to llvm) if I guessed 
correctly and the patch is helpful.

-- 
Anton

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