fix float loads, add dgo loading to game test

[water111]

Implement a missing case for loading floats that was causing the compiler to error when compiling vector-dot, and add a test for this and some functions from the game which use this.

More importantly, this loads GAME.DGO as part of the game tests, which I forgot to do previously. I think KERNEL was being loaded the first time which is why not everything broke. But that means we never tested a big DGO load (checks for bugs in DGO IOP state machine code) and reloading the kernel (checks for bugs in kscheme on redefinitions) I really hope this works on windows...

[coveralls]

Pull Request Test Coverage Report for Build 328040957

• 18 of 24 (75.0%) changed or added relevant lines in 3 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 81.979%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
goalc/compiler/IR.cpp	4	5	80.0%
goalc/compiler/Val.cpp	7	12	58.33%

Files with Coverage Reduction	New Missed Lines	%
goalc/emitter/IGen.h	3	96.53%

Totals
Change from base Build 327902243:	0.05%
Covered Lines:	15171
Relevant Lines:	18506

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💛 - Coveralls