Add back constant select tests. NFC.
# RUN: llc -mtriple=aarch64-- -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s

--- |
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"

  define i32 @const_s32() { ret i32 42 }
  define i64 @const_s64() { ret i64 1234567890123 }

  define i32 @fconst_s32() { ret i32 42 }
  define i64 @fconst_s64() { ret i64 1234567890123 }
...

---
# CHECK-LABEL: name: const_s32
name:            const_s32
legalized:       true
regBankSelected: true
registers:
  - { id: 0, class: gpr }

# CHECK:  body:
# CHECK: %0 = MOVi32imm 42
body:             |
  bb.0:
    %0(s32) = G_CONSTANT i32 42
...

---
# CHECK-LABEL: name: const_s64
name:            const_s64
legalized:       true
regBankSelected: true
registers:
  - { id: 0, class: gpr }

# CHECK:  body:
# CHECK: %0 = MOVi64imm 1234567890123
body:             |
  bb.0:
    %0(s64) = G_CONSTANT i64 1234567890123
...

---
# CHECK-LABEL: name: fconst_s32
name:            fconst_s32
legalized:       true
regBankSelected: true
registers:
  - { id: 0, class: fpr }

# CHECK:  body:
# CHECK: [[TMP:%[0-9]+]] = MOVi32imm 1080033280
# CHECK: %0 = COPY [[TMP]]
body:             |
  bb.0:
    %0(s32) = G_FCONSTANT float 3.5
...

---
# CHECK-LABEL: name: fconst_s64
name:            fconst_s64
legalized:       true
regBankSelected: true
registers:
  - { id: 0, class: fpr }

# CHECK:  body:
# CHECK: [[TMP:%[0-9]+]] = MOVi64imm 4607182418800017408
# CHECK: %0 = COPY [[TMP]]
body:             |
  bb.0:
    %0(s64) = G_FCONSTANT double 1.0
...