This patch adds four new opcode predictions:

BUILD_MAP_UNPACK_WITH_CALL -> CALL_FUNCTION_EX:
 - Emitted whenever more than one map of **kwargs is unpacked into a call.
 - Pair *always* occurs together.

LOAD_BUILD_CLASS -> LOAD_CONST:
 - Emitted whenever a class is defined *without* the use of cell vars.
 - Occurs ~93% of the time, in my analysis.

LOAD_BUILD_CLASS -> LOAD_CLOSURE:
 - Emitted whenever a class is defined *with* the use of cell vars.
 - Occurs the other ~7% of the time

LOAD_ASSERTION_ERROR -> RAISE_VARARGS:
 - Emitted whenever the one-argument form of "assert" is used.
 - Occurs ~91% of the time.