Define an operator<< for APInt to be used with std::ostream.

This will allow it to be used in unittests that use gtest's
EXPECT_EQ.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74494 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/APInt.cpp

@@ -2178,6 +2178,12 @@ void APInt::print(raw_ostream &OS, bool isSigned) const {
   OS << S.c_str();
 }
 
+std::ostream &operator<<(std::ostream &o, const APInt &I) {
+  raw_os_ostream OS(o);
+  OS << I;
+  return o;
+}
+
 // This implements a variety of operations on a representation of
 // arbitrary precision, two's-complement, bignum integer values.