[MERGE #4146 @sigatrev] ARM64: fix indir float crash
[MERGE #4146 @sigatrev] ARM64: fix indir float crash

Merge pull request #4146 from sigatrev:floatIndir

The block a modified left over from ARM, and was attempting to legalize it with a pre-lowered op code. Float Indirs need to be legalized, but in this case it will be legalized with the FMOVs inserted by EmitLoadFloatCommon.

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