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x86-ncg: Fix fma codegen when arguments are globals.

Andreas Klebinger requested to merge wip/andreask/fma_globals into master 
x86-ncg: Fix fma codegen when arguments are globals.

Fix a bug in the x86 ncg where results would be wrong when the desired output
register and one of the input registers were the same global.

Also adds a tiny optimization to make use of the memory addressing
support when convenient.

Fixes #24496

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