[clang] [llvm] [RISCV][LLVM] Enable atomics for 'Zalrsc' (PR #163672)

[Alexander Richardson via cfe-commits]

================
@@ -225,7 +225,7 @@ class LLVM_LIBRARY_VISIBILITY RISCV64TargetInfo : public RISCVTargetInfo {
   void setMaxAtomicWidth() override {
     MaxAtomicPromoteWidth = 128;
 
-    if (ISAInfo->hasExtension("a"))
+    if (ISAInfo->hasExtension("a") || ISAInfo->hasExtension("zalrsc"))
----------------
arichardson wrote:

Shouldn't a imply zalrsc?

https://github.com/llvm/llvm-project/pull/163672