[APInt] Move the >64 bit case for flipAllBits out of line.

This is more consistent with what we do for other operations. This shrinks the opt binary on my build by ~72k.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298858 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/APInt.cpp

@@ -581,6 +581,11 @@ void APInt::clearBit(unsigned bitPosition) {
 }
 
 /// @brief Toggle every bit to its opposite value.
+void APInt::flipAllBitsSlowCase() {
+  for (unsigned i = 0; i < getNumWords(); ++i)
+    pVal[i] ^= UINT64_MAX;
+  clearUnusedBits();
+}
 
 /// Toggle a given bit to its opposite value whose position is given
 /// as "bitPosition".