Fix floating point registers ld/st bug of Loongarch #5558
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Some floating-point registers need to save their full values (64 bits) before and after function calls. However, when using ST/LD macros, the fst.s/fld.s directive may actually be used, which only saves a 32-bit value. This may lead to some unexpected mistakes.
This patch do same thing with commit e05d98d.