C++: Delete a noisy test that's not very helpful.

cpp/ql/test/library-tests/ir/ir/operand_locations.ql

@@ -1,7 +0,0 @@
-private import cpp
-private import semmle.code.cpp.ir.IR
-private import PrintConfig
-
-from Operand a
-where not locationIsInStandardHeaders(a.getLocation())
-select a, a.getDumpString()