[RISCV][GISel] Use correct constant for i32 INT_MAX in test. NFC

Author: topperc

llvm/test/CodeGen/RISCV/GlobalISel/instruction-select/constant64.mir

@@ -182,9 +182,10 @@ body:            |
     ; CHECK: liveins: $x10
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[LUI:%[0-9]+]]:gpr = LUI 524288
-    ; CHECK-NEXT: $x10 = COPY [[LUI]]
+    ; CHECK-NEXT: [[ADDIW:%[0-9]+]]:gpr = ADDIW [[LUI]], -1
+    ; CHECK-NEXT: $x10 = COPY [[ADDIW]]
     ; CHECK-NEXT: PseudoRET implicit $x10
-    %0:gprb(s32) = G_CONSTANT i32 2147483648
+    %0:gprb(s32) = G_CONSTANT i32 2147483647
     %1:gprb(s64) = G_ANYEXT %0(s32)
     $x10 = COPY %1(s64)
     PseudoRET implicit $x10