ppc64: Cast mask to sljit_sw in TEST_UI_IMM macro (#360) #306

Job	Run time
Build and test on x64	34s
Build and test on x86	34s
Build and test on riscv64 with extensions	2m 6s
Build and test on armv7	2m 5s
Build and test on riscv32 with extensions	2m 13s
Build and test on armt2	2m 21s
Build and test on riscv64	2m 20s
Build and test on aarch64	2m 38s
Build and test on riscv32	1m 56s
Build and test on s390x	1m 52s
Build and test on loongarch64	1m 57s
	20m 36s

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