[RISCV] Add asserts that we don't increase codesize during pseudo expansion

We currently assume that pseudo expansion doesn't increase the distance between a branch and it's label. This patch adds some asserts to catch violations of this property in pseudo expansion.

I chose to only do the assertion at the function level as we have to scan the whole function for size changes (since expansion can create multiple blocks). We could cache individual block sizes, and thus make the check cheap enough to do after every expansion, but that requires more complex code.

Differential Revision: https://reviews.llvm.org/D142777

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