Subzero, MIPS32: Remove --skip-unimplemented from lit tests

tests_lit/llvm2ice_tests/fp_const_pool.ll

 ; This tests that different floating point constants (such as 0.0 and -0.0)
 ; remain distinct even when they sort of look equal, and also that different
 ; instances of the same floating point constant (such as NaN and NaN) get the
 ; same constant pool entry even when "a==a" would suggest they are different.
 
 ; REQUIRES: allow_dump
 
 ; RUN: %if --need=target_MIPS32 --need=allow_dump \
 ; RUN:   --command %p2i --filetype=asm --assemble --disassemble \
-; RUN:   --target mips32 -i %s --args -O2 --skip-unimplemented \
+; RUN:   --target mips32 -i %s --args -O2 \
 ; RUN:   | %if --need=target_MIPS32 --need=allow_dump \
 ; RUN:   --command FileCheck --check-prefix MIPS32 %s
 
 define internal void @consume_float(float %f) {
   ret void
 }
 
 define internal void @consume_double(double %d) {
   ret void
 }
@@ skipping 83 matching lines @@
 ; NANS3-NOT: double nan
 ;
 ; RUN: %p2i -i %s --filetype=asm --llvm-source \
 ; RUN:   | FileCheck --check-prefix=NANS4 %s
 ; NANS4: double -nan
 ; NANS4-NOT: double -nan
 
 ; MIPS32 constant pool
 ; RUN: %if --need=target_MIPS32 --command %p2i \
 ; RUN:   --target mips32 -i %s --filetype=asm --llvm-source \
-; RUN:   --args -O2 --skip-unimplemented \
+; RUN:   --args -O2 \
 ; RUN:   | %if --need=target_MIPS32 --command FileCheck \
 ; RUN:   --check-prefix=MIPS32CP %s
 ; MIPS32CP-LABEL: .L$float$7fc00000:
 ; MIPS32CP: .word 0x7fc00000 /* f32 nan */
 ; MIPS32CP-LABEL: .L$float$80000000
 ; MIPS32CP: .word 0x80000000 /* f32 -0.000000e+00 */
 ; MIPS32CP-LABEL: .L$float$ffc00000
 ; MIPS32CP: .word 0xffc00000 /* f32 -nan */
 ; MIPS32CP-LABEL: .L$double$7ff8000000000000
 ; MIPS32CP: .quad 0x7ff8000000000000 /* f64 nan */
 ; MIPS32CP-LABEL: .L$double$8000000000000000
 ; MIPS32CP: .quad 0x8000000000000000 /* f64 -0.000000e+00 */
 ; MIPS32CP-LABEL: .L$double$fff8000000000000
 ; MIPS32CP: .quad 0xfff8000000000000 /* f64 -nan */