Create a new #include "Support/..." directory structure to move things

from "llvm/Support/..." that are not llvm dependant.

Move files and fix #includes


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1400 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/MathExtras.h

@@ -0,0 +1,32 @@
+// $Id$ -*-c++-*-
+//***************************************************************************
+// File:
+//	MathExtras.h
+// 
+// Purpose:
+//	
+// History:
+//	8/25/01	 -  Vikram Adve  -  Created
+//**************************************************************************/
+
+#ifndef LLVM_SUPPORT_MATH_EXTRAS_H
+#define LLVM_SUPPORT_MATH_EXTRAS_H
+
+#include <sys/types.h>
+
+inline bool	IsPowerOf2	(int64_t C, unsigned& getPow);
+
+inline
+bool IsPowerOf2(int64_t C, unsigned& getPow)
+{
+  if (C < 0)
+    C = -C;
+  bool isBool = C > 0 && (C == (C & ~(C - 1)));
+  if (isBool)
+    for (getPow = 0; C > 1; getPow++)
+      C = C >> 1;
+  
+  return isBool;
+}
+
+#endif /*LLVM_SUPPORT_MATH_EXTRAS_H*/