cmd/compile: mark MOVWF/MOVFW clobbering F15 on ARM
The assembler back end uses F15 as a temporary register in these instructions. Checked the assembler back end and made sure that this is the only case clobbering F15. Fixes #19403. Change-Id: I02b9e00fdd9229db899f501c8e9b306e02912d83 Reviewed-on: https://go-review.googlesource.com/37792 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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