Use function to expand integer rem/dev in-line instead of calling rtlib function

[jbush001]

Currently the urem/udiv instructions generate calls to __udivdsi/etc...

There is code in LLVM that will create expand division with IR. Should call this instead, which will probably generate better code:

NyuziToolchain/lib/Transforms/Utils/IntegerDivision.cpp

Lines 148 to 155 in 80970d2

	/// Generates code to divide two unsigned scalar 32-bit or 64-bit integers.
	/// Returns the quotient, rounded towards 0. Builder's insert point should
	/// point where the caller wants code generated, e.g. at the udiv instruction.
	static Value *generateUnsignedDivisionCode(Value *Dividend, Value *Divisor,
	IRBuilder<> &Builder) {
	// The basic algorithm can be found in the compiler-rt project's
	// implementation of __udivsi3.c. Here, we do a lower-level IR based approach
	// that's been hand-tuned to lessen the amount of control flow involved.