[RISCV] Add test coverage for TSO AMOs [nfc]

Author: preames

llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll

@@ -3,10 +3,14 @@
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 ; RUN: llc -mtriple=riscv32 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IA %s
+; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
+; RUN:   | FileCheck -check-prefix=RV32IA %s
 ; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IA %s
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
+; RUN:   | FileCheck -check-prefix=RV64IA %s
 
 define void @cmpxchg_i8_monotonic_monotonic(ptr %ptr, i8 %cmp, i8 %val) nounwind {
 ; RV32I-LABEL: cmpxchg_i8_monotonic_monotonic:

llvm/test/CodeGen/RISCV/atomic-rmw.ll

@@ -3,10 +3,14 @@
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 ; RUN: llc -mtriple=riscv32 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32IA %s
+; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
+; RUN:   | FileCheck -check-prefix=RV32IA %s
 ; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64IA %s
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
+; RUN:   | FileCheck -check-prefix=RV64IA %s
 
 define i8 @atomicrmw_xchg_i8_monotonic(ptr %a, i8 %b) nounwind {
 ; RV32I-LABEL: atomicrmw_xchg_i8_monotonic: