[SubZero] Utilize instructions with immediate operands

tests_lit/llvm2ice_tests/adv-switch-opt.ll

 ; This tests the advanced lowering of switch statements. The advanced lowering
 ; uses jump tables, range tests and binary search.
 
 ; RUN: %p2i -i %s --target=x8632 --filetype=obj --disassemble --args -O2 \
 ; RUN:   | FileCheck %s --check-prefix=CHECK --check-prefix=X8632
 ; RUN: %p2i -i %s --target=x8664 --filetype=obj --disassemble --args -O2 \
 ; RUN:   | FileCheck %s --check-prefix=CHECK --check-prefix=X8664
 
 ; RUN: %if --need=target_MIPS32 --need=allow_dump \
 ; RUN:   --command %p2i --filetype=asm --assemble --disassemble --target \
@@ skipping 37 matching lines @@
 ; Note: x86-32 may do "mov eax, [...]; jmp eax", whereas x86-64 may do
 ; "mov eax, [...]; jmp rax", so we assume the all characters except the first
 ; one in the register name will match.
 
 ; MIPS32-LABEL: testJumpTable
 ; MIPS32:       move    [[REG1:.*]],{{.*}}
 ; MIPS32:       li      [[REG2:.*]],91
 ; MIPS32:       beq     [[REG1]],[[REG2]],6c <.LtestJumpTable$sw.default>
 ; MIPS32:       nop
 ; MIPS32:       li      [[REG2:.*]],92
-; MIPS32:       beq     [[REG1]],[[REG2]],7c <.LtestJumpTable$sw.bb1>
+; MIPS32:       beq     [[REG1]],[[REG2]],78 <.LtestJumpTable$sw.bb1>
 ; MIPS32:       nop
 ; MIPS32:       li      [[REG2:.*]],93
 ; MIPS32:       beq     [[REG1]],[[REG2]],6c <.LtestJumpTable$sw.default>
 ; MIPS32:       nop
 ; MIPS32:       li      [[REG2:.*]],99
-; MIPS32:       beq     [[REG1]],[[REG2]],7c <.LtestJumpTable$sw.bb1>
+; MIPS32:       beq     [[REG1]],[[REG2]],78 <.LtestJumpTable$sw.bb1>
 ; MIPS32:       nop
 ; MIPS32:       li      [[REG2:.*]],98
 ; MIPS32:       beq     [[REG1]],[[REG2]],6c <.LtestJumpTable$sw.default>
 ; MIPS32:       nop
 ; MIPS32:       li      [[REG2:.*]],96
-; MIPS32:       beq     [[REG1]],[[REG2]],7c <.LtestJumpTable$sw.bb1>
+; MIPS32:       beq     [[REG1]],[[REG2]],78 <.LtestJumpTable$sw.bb1>
 ; MIPS32:       nop
 ; MIPS32:       li      [[REG2:.*]],97
 ; MIPS32:       beq     [[REG1]],[[REG2]],60 <.LtestJumpTable$split_entry_sw.epilog_0>
 ; MIPS32:       nop
 ; MIPS32:       b       6c <.LtestJumpTable$sw.default>
 ; MIPS32:       nop
 
 ; Continuous ranges which map to the same target should be grouped and
 ; efficiently tested.
 define internal i32 @testRangeTest() {
@@ skipping 231 matching lines @@
   br label %return
 
 return:
   %retval.0 = phi i32 [ 5, %sw.default ], [ 4, %sw.bb3 ], [ 3, %sw.bb2 ], [ 2, %sw.bb1 ], [ 1, %entry ]
   ret i32 %retval.0
 }
 
 ; TODO(ascull): this should generate a jump table. For now, just make sure it
 ; doesn't crash the compiler.
 ; CHECK-LABEL: testJumpTable64