This adds operations for binary multiplicative arithmetic operators to
EmitC. The input and output arguments for the remainder operator are
restricted to index (emitted as size_t), integers and the EmitC opaque
types (as the operator can be overloaded for a custom type). The
multiplication and division operator further support floating point
numbers.
Reviewed By: jpienaar
Differential Revision: https://reviews.llvm.org/D154846
a2426eb603