Subzero, MIPS32: Enable MIPS support in lit tests

tests_lit/llvm2ice_tests/fused-alloca-arg.ll

 ; This is a basic test of the alloca instruction and a call.
 
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
 ; RUN:   --target x8632 -i %s --args -O2 -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_X8632 --command FileCheck %s
 
+; RUN: %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command %p2i --filetype=asm --assemble --disassemble --target \
+; RUN:   mips32 -i %s --args -O2 -allow-externally-defined-symbols \
+; RUN:   | %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command FileCheck --check-prefix MIPS32 %s
+
 declare void @copy(i32 %arg1, i8* %arr1, i8* %arr2, i8* %arr3, i8* %arr4);
 
 ; Test that alloca base addresses get passed correctly to functions.
 define internal void @caller1(i32 %arg) {
 entry:
   %a1 = alloca i8, i32 32, align 4
   %p1 = bitcast i8* %a1 to i32*
   store i32 %arg, i32* %p1, align 1
   call void @copy(i32 %arg, i8* %a1, i8* %a1, i8* %a1, i8* %a1)
   ret void
 }
 
 ; CHECK-LABEL:  caller1
 ; CHECK-NEXT:   sub    esp,0x4c
 ; CHECK-NEXT:   mov    eax,DWORD PTR [esp+0x50]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x20],eax
 ; CHECK-NEXT:   mov    DWORD PTR [esp],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x20]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x4],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x20]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x8],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x20]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0xc],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x20]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x10],eax
 ; CHECK-NEXT:   call
 ; CHECK-NEXT:   add    esp,0x4c
 ; CHECK-NEXT:   ret
+; MIPS32-LABEL: caller1
+; MIPS32:       addiu   sp,sp,-52
+; MIPS32:       sw      ra,48(sp)
+; MIPS32:       move    v0,a0
+; MIPS32:       sw      v0,16(sp)
+; MIPS32:       addiu   v0,sp,16
+; MIPS32:       sw      v0,16(sp)
+; MIPS32:       addiu   a1,sp,16
+; MIPS32:       addiu   a2,sp,16
+; MIPS32:       addiu   a3,sp,16
+; MIPS32:       jal
+; MIPS32:       nop
+; MIPS32:       lw      ra,48(sp)
+; MIPS32:       addiu   sp,sp,52
+; MIPS32:       jr      ra
 
 ; Test that alloca base addresses get passed correctly to functions.
 define internal void @caller2(i32 %arg) {
 entry:
   %a1 = alloca i8, i32 32, align 4
   %a2 = alloca i8, i32 32, align 4
   %p1 = bitcast i8* %a1 to i32*
   %p2 = bitcast i8* %a2 to i32*
   store i32 %arg, i32* %p1, align 1
   store i32 %arg, i32* %p2, align 1
@@ skipping 11 matching lines @@
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x4],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x40]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x8],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x20]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0xc],eax
 ; CHECK-NEXT:   lea    eax,[esp+0x40]
 ; CHECK-NEXT:   mov    DWORD PTR [esp+0x10],eax
 ; CHECK-NEXT:   call
 ; CHECK-NEXT:   add    esp,0x6c
 ; CHECK-NEXT:   ret
+; MIPS32-LABEL: caller2
+; MIPS32:       addiu   sp,sp,-84
+; MIPS32:       sw      ra,80(sp)
+; MIPS32:       move    v0,a0
+; MIPS32:       sw      v0,16(sp)
+; MIPS32:       move    v0,a0
+; MIPS32:       sw      v0,48(sp)
+; MIPS32:       addiu   v0,sp,48
+; MIPS32:       sw      v0,16(sp)
+; MIPS32:       addiu   a1,sp,16
+; MIPS32:       addiu   a2,sp,48
+; MIPS32:       addiu   a3,sp,16
+; MIPS32:       jal
+; MIPS32:       nop
+; MIPS32:       lw      ra,80(sp)
+; MIPS32:       addiu   sp,sp,84
+; MIPS32:       jr      ra