Add a test case for the default mapping of RegBankSelect.
# RUN: llc -O0 -run-pass=regbankselect -global-isel %s -o - 2>&1 | FileCheck %s
# REQUIRES: global-isel

--- |
  ; ModuleID = 'generic-virtual-registers-type-error.mir'
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64-apple-ios"
  define void @defaultMapping() {
  entry:
    ret void
  }
  define void @defaultMappingVector() {
  entry:
    ret void
  }
...

---
# Check that we assign a relevant register bank for %0.
# Based on the type i32, this should be gpr.
name:            defaultMapping
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gpr }
registers:
  - { id: 0, class: _ }
body: |
  bb.0.entry:
    liveins: %x0
    ; CHECK:      %0(32) = G_ADD i32 %x0
    %0(32) = G_ADD i32 %x0, %x0
...

---
# Check that we assign a relevant register bank for %0.
# Based on the type <2 x i32>, this should be fpr.
# FPR is used for both floating point and vector registers.
name:            defaultMappingVector
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: fpr }
registers:
  - { id: 0, class: _ }
body: |
  bb.0.entry:
    liveins: %d0
    ; CHECK:      %0(32) = G_ADD <2 x i32> %d0
    %0(32) = G_ADD <2 x i32> %d0, %d0
...